Patent Publication Number: US-2022225004-A1

Title: Charging kit for charging one or more rechargeable hearing devices

Description:
RELATED APPLICATION DATA 
     This application claims priority to, and the benefit of, Danish Patent Application No. PA20210010 filed on Jan. 8, 2021. The entire disclosure of the above application is expressly incorporated by reference herein. 
     FIELD 
     The present disclosure relates to a charging kit for charging one or more rechargeable hearing devices. More specifically, the disclosure relates to a charging kit or assembly for charging one or more rechargeable hearing devices as defined in the introductory parts of independent claim/-s. 
     BACKGROUND ART 
     To remove the need for charging batteries in a hearing device, hearing devices are designed to be rechargeable. As such, hearing devices are often equipped with rechargeable batteries that can be recharged in a hearing device charger, while the batteries are still in the hearing device. To charge the hearing device, the hearing device is inserted into an insert cavity of the hearing device charger. For effective charging of the hearing device, the hearing device is held in a charging position in the hearing device charger, such that the receiver charging element in the hearing device is placed close to the transmitter charging element in the charger. 
     A problem with the solutions of the prior art is that each hearing aid charger for this reason only supports hearing aids having a specific form factor, i.e. specific outer dimensions. This result in a great number of chargers on the market to support charging of e.g. different generations of hearing aids or that the hearing aid manufacture is locked to a specific outer design in order to supply hearing aids usable with current chargers on the market. A further problem with the solution of the prior art is that the charger manufacturer has to store spare parts and support repairs of many different hearing device chargers. 
     There is thus a need for an improved hearing aid charger design, which can be easily adapted to support hearing aids with different outer dimensions, such as hearing devices of different shapes and sizes, and provides effective charging. 
     SUMMARY 
     It is an object of the present disclosure to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages in the prior art and solve at least the above-mentioned problem. 
     In one aspect, one or more of the above objects are achieved by means of a charging kit or assembly to charge hearing devices, as claimed in the associated independent claim, preferred variants thereof being defined in associated dependent claims. 
     According to a first aspect there is provided a charging kit for charging one or more rechargeable hearing devices, the hearing device being configured to be worn by a user, the charging kit comprising a base charger being configured to receive a first model specific insert, the base charger comprising a transmitter charging element, where the first model specific insert is adapted to removably receive at least a first model specific hearing device of the one or more hearing devices, the first model specific hearing device comprising a first receiver charging element, characterized in that the transmitter charging element is arranged in the base charger on an adjustable support being configured to provide an adaptable positioning of the transmitter charging element, whereby the transmitter charging element is configured to be urged (or biased) towards the first model specific insert when the first model specific insert is placed in (and/or inserted into) the base charger thereby enabling energy to be transferrable from the transmitter charging element to the first receiver charging element of the first model specific hearing device when placed in the first model specific insert. 
     According to some embodiments, the base charger is configured to receive a second model specific insert, where the second model specific insert is adapted to removably receive at least a second model specific hearing device of the one or more hearing devices, the second model specific hearing device comprising a second receiver charging element, and wherein the adjustable support of the transmitter charging element is adapted to provide the adaptable positioning of the transmitter charging element, so that the transmitter charging element is configured to be urged (or biased) towards the second model specific insert when the second model specific insert is placed in (and/or inserted into) the base charger enabling energy to be transferrable from the transmitter charging element to the second receiver charging element of the second model specific hearing device when the second model specific hearing device is placed in the second model specific insert. 
     According to some embodiments, the base charger comprises a cavity configured to mate with the first model specific insert and/or the second model specific insert, and/or each model specific insert comprises at least one model specific insert cavity configured to mate with the first or second model specific hearing device, respectively. 
     According to some embodiments, the first and/or second model specific insert or each of the first and/or second model specific insert comprises two model specific insert cavities of which each model specific insert cavity is configured to mate with one of a pair of the first model specific hearing devices or to mate with one of a pair of the second model specific hearing devices. 
     According to some embodiments, at least one of the first model specific hearing devices and/or at least one of the second model specific hearing devices is configured for wireless charging. Wireless charging may be obtained by means of inductive coupling, capacitive coupling, magnetic coupling, radio frequencies, light waves and/or sound waves, etc. In case the wireless charging is obtained by means of inductive coupling, the transmitter charging element(s) may be one or more transmitter coils and the receiver charging element(s) may be one or more receiver coils, such as respectively one or more inductive transmitter coils and one or more inductive receiver coils. 
     According to some embodiments, one or more or all of the first and/or the second model specific hearing devices is/are inductively chargeable. 
     According to some embodiments, the base charger comprises a cavity configured to mate with the first model specific insert and/or a/the second model specific insert, and the transmitter charging element is arranged to be positioned at a start (or base) position in the cavity of the base charger before the first model specific insert is placed in the base charger, and the transmitter charging element is configured to be displaced to a first position by the first model specific insert and to act with a bias or urging force towards the first model specific insert when the first model specific insert is placed in (and/or inserted into) the base charger, the first position being different from the start (or base) position. 
     According to some embodiments, the transmitter charging element is configured to be displaced to the first position to align with the first receiver charging element of the first model specific hearing device, when the first model specific hearing device is placed in the first model specific insert in the base charger, and to act with a bias or urging force towards the first model specific insert and the first receiver charging element of the first model specific hearing device. 
     According to some embodiments, the base charger comprises a cavity configured to mate with the first model specific insert and/or a/the second model specific insert, and the transmitter charging element is arranged to be positioned at the start (or base) position in the cavity of the base charger before the second model specific insert is placed in the base charger, and the transmitter charging element is configured to be displaced to a second position by the second model specific insert and to act with a bias or urging force towards the second model specific insert when the second model specific insert is placed in the base charger, the second position being different from the start (or base) position. 
     According to some embodiments, the transmitter charging element is configured to be displaced to the second position to align with the second receiver charging element of the second model specific hearing device, when the second model specific hearing device is placed in the second model specific insert in the base charger, and to act with a bias or urging force towards the second model specific insert and the second receiver charging element of the second model specific hearing device. 
     According to some embodiments, the first distance between the start (or base) position and the first position is shorter, equal to or longer than the second distance between the start (or base) position and the second position. 
     According to some embodiments, the adjustable support comprises an elastic element configured to make the transmitter charging element of the base charger movable between different positions in the base charger and able to act with a bias or urging force towards or against or into contact with the first model specific insert or the second model specific insert when the first or second model specific insert is placed in the base charger. 
     According to some embodiments, the elastic element of the adjustable support make the transmitter charging element of the base charger movable between different positions in the base charger, when the first or second model specific hearing device is placed in the first or second model specific insert in the base charger, and able to act with a bias or urging force towards or against or into contact with the first receiver charging element of the first model specific hearing device, when the first model specific hearing device is placed in the first model specific insert in the base charger, and able to act with a bias or urging force towards or against or into contact with the second receiver charging element of the second model specific hearing device, when the second model specific hearing device is placed in the second model specific insert in the base charger. 
     According to some embodiments, the base charger comprises a cavity configured to mate with the first model specific insert and/or a/the second model specific insert, and the adjustable support comprises an elongated body with a first free end and a second end opposite the first free end, whereby the transmitter charging element is arranged on the first free end of the adjustable support and the second end of the adjustable support is attached or connected to a guide or attachment point in the base charger, and the first free end of the adjustable support is arranged movable/displaceable in the cavity of the base charger. 
     According to some embodiments, the elongated body of the adjustable support comprises or is the elastic element. 
     According to some embodiments, the adjustable support comprises an elastic element arranged at least partly between the first free end and the second end to exert a push force urging the first free end of the adjustable support and/or the transmitter charging element inside the base charger in a direction being substantially perpendicular or perpendicular to the direction of insertion of the first model specific insert and/or the second model specific insert. 
     According to some embodiments, the adjustable support comprises an elastic element arranged at least partly between the first free end and the second end to exert a push force urging the first free end of the adjustable support and/or the transmitter charging element inside the base charger in a direction being inclined or substantially in parallel with or in parallel with the direction of insertion of the first model specific insert and/or the second model specific insert. 
     According to some embodiments, the base charger comprises one or more insert receiving cavities, whereby the first free end of the adjustable support and/or the transmitter charging element are/is arranged at least partly in or fully outside the insert receiving cavities of the base charger. 
     According to some embodiments, the base charger comprises one or more insert receiving cavities in which the model specific inserts with the model specific insert cavities are received, whereby the first free end of the adjustable support and/or the transmitter charging element are/is arranged at least partly in or fully outside the model specific insert cavities. 
     According to some embodiments, the base charger comprises one or more insert receiving cavities in which the model specific inserts with the model specific insert cavities are received, whereby the first free end of the adjustable support and/or the transmitter charging element are/is arranged at least partly in or fully outside the model specific insert cavities and the insert receiving cavities of the base charger. 
     According to some embodiments, each of the model specific insert cavities of the first or second model specific inserts is defined by an insert cavity wall and wherein each insert cavity comprises one or more through holes, wherein the first free end of the adjustable support and/or the transmitter charging element are/is arranged at least partly in one or more of the through holes when one of the first and/or second model specific inserts is placed in the base charger. 
     According to some embodiments, the elastic element of the adjustable support is arranged at least partly restrained between the first free end and the second end to be pre-tensioned to exert the bias or urging force. 
     According to some embodiments, the elastic element is configured to extend along the elongated body of the adjustable support and to enclose or encompass or surround or cover at least a part of the outer surface of the elongated body of the adjustable support. 
     According to some embodiments, the elastic element comprises at least one helical spring or at least one leaf spring or the elastic element is made up of at least one helical spring or at least one leaf spring. 
     According to some embodiments, the elastic element comprises or is made up of at least two leaf springs arranged in a sandwiched or laminated manner. 
     According to some embodiments, the elastic element is made of metal or plastic or any combination of those materials. 
     According to some embodiments, the helical or leaf spring of the elastic element is made of metal or plastic or any combination of those materials. 
     According to some embodiments, the first free end of the adjustable support comprising the transmitter charging element is a hinged or pivotable part of the elongated body of the adjustable support. 
     According to some embodiments, the transmitter charging element is connected to the first free end of the adjustable support via a pivot or hinge. 
     According to some embodiments, the adjustable support comprises a protruding member or arm or lever arranged between the first free end and the second end, the protruding member being configured to be engaged by any of the first or second model specific insert when any of the first or second model specific insert is introduced into the base charger, whereby the first free end and the transmitter charging element is urged (or bias) towards the model specific insert. 
     According to some embodiments, the second end of the adjustable support is pivotally attached to the frame of the base charger via a torsion hinge. 
     According to some embodiments, the adjustable support comprises a compressible element arranged at least partly between the first free end and the transmitter charging element to provide a flexibility and/or a tolerance adaptability and/or to exert a bias or urging force urging the first free end of the adjustable support and/or the transmitter charging element away from each other and/or towards the first or second model specific insert, when the first or second model specific insert is placed in the base charger, in a direction being substantially perpendicular or perpendicular to the direction of insertion of the first model specific insert and/or the second model specific insert. Alternatively, the direction may be substantially in parallel with or in parallel with or inclined to the direction of insertion of the first model specific insert and/or the second model specific insert. 
     The charging kit or assembly is defined herein as a hearing device charger comprising at least a base charger and a hearing device model specific insert without a hearing device, i.e. when no hearing device is placed in the associated hearing device model specific insert of the hearing device charger. The base charger of the hearing device charger could be defined as a base charging station. When one or more hearing devices are placed in the associated hearing device model specific insert of the hearing device charger, the charging kit or assembly, i.e. the hearing device charger also comprises the hearing device as any charging of the hearing device is not possible to perform before placing a hearing device in the hearing device charger. The hearing device or pair of hearing devices may be embodied in various housing styles or form factors for example as so-called Behind-the-ear (BTE) hearing device, Receiver-in-the-ear (RIE) hearing device, Receiver-in-the Canal (RIC) hearing device, Microphone-and-Receiver-in ear (M&amp;RIE) hearing device. The hearing device or pair of hearing devices may preferably comprise at least a signal processor configured to compensate for the users hearing loss. 
     The above described solution(s) disclose(s) a hearing device charger based on a product platform comprising a base charger useable with a number of different hearing device model specific inserts. This removes the need of development of a new hearing aid charger every time the outer dimensions on a new type or generation of hearing aids is different from the existing ones. To support charging of a new hearing aid with different outer dimension by means of the same base charger only a new model specific insert is needed therein. 
     The disclosed solution(s) enable(s) dislocating of the transmitter charging element in a hearing device charger dependent on which hearing device model specific insert is placed in the charger. The disclosed solution(s) provide(s) hearing device chargers with e.g. two, three, four or even up to ten or more different hearing device model specific inserts, each model specific insert being suitable for holding an associated type or model or group of models of hearing devices due to differing specific outer dimension, such as size and/or shape, for each hearing device. 
     The disclosed solution(s) ensure(s) that the distance between and the positions of the transmitter charging element in the hearing device charger and the receiver charging element in any of the different hearing devices is optimal to provide effective charging when placed in the model specific insert inside the hearing device charger as the transmitter charging element is movable in the hearing device charger to adapt its placement to the shape and size of the selected model specific hearing device insert and associated hearing device. 
     Hereby is provided a hearing device charger both being able to support hearing aids with different outer dimensions and to provide effective charging. 
     A further advantage is that the disclosed solution(s) provide(s) enable(s) keeping/maintaining the symmetry for different hearing device model specific inserts when placed in one or in the same or in one and the same or in a common hearing device charger. 
     Yet a further advantage is that the base charger may be returned to the manufacturing site and reused multiple times by exchanging one model specific insert with another. Another advantage is that the base charger may be refurbished multiple times by being adapted to different model specific hearing devices with model specific inserts, such as when introducing a new generation of hearing aids to the market. This enables exchange of the housing and other outer/user accessible parts of the base charger as well due to health regulations. 
     The model specific insert is preferably mounted in the charger during the assembly of the hearing device charger at the manufacturing site. 
     A model specific hearing device may be part of a hearing device family, wherein all model specific hearing devices in the hearing device family are configured to be used with/fit in the same hearing device model specific insert. 
     The present disclosure will become apparent from the detailed description given below. The detailed description and specific examples disclose preferred embodiments of the disclosure by way of illustration only. Those skilled in the art understand from guidance in the detailed description that changes and modifications may be made within the scope of the disclosure. 
     Hence, it is to be understood that the herein disclosed disclosure is not limited to the particular component parts of the device described or steps of the methods described since such device and method may vary. It is also to be understood that the terminology used herein is for purpose of describing particular embodiments only, and is not intended to be limiting. It should be noted that, as used in the specification and appended claim, the articles “a”, “an”, “the”, and “said” are intended to mean that there are one or more of the elements unless the context explicitly dictates otherwise. Thus, for example, reference to “a unit” or “the unit” may include several devices, and the like. Furthermore, words like “comprising”, “including”, “containing” and similar wordings does not exclude other elements or steps. Moreover, reference to a first or a second model specific insert also mean referring to a first model specific insert already assembled in the base charger, which first model specific insert is replaced by another model specific insert being for example a third or fourth or fifth model specific insert as the base charger is adapted to receive different types of model specific inserts, i.e. one different model specific insert at a time. These different types of model specific inserts that the base charger is configured to receive could e.g. be a first type of model specific insert or a second type of model specific insert or a third type of model specific insert or a fourth type of model specific insert, i.e. any suitable n:th type of model specific insert. 
     The present disclosure relates to different aspects including the system/kit/assembly described above and in the following, and corresponding system parts, methods, devices, systems, kits, uses and/or product means, each yielding one or more of the benefits and advantages described in connection with the first mentioned aspect, and each having one or more embodiments corresponding to the embodiments described in connection with the first mentioned aspect and/or disclosed in the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above objects, as well as additional objects, features and advantages of the present disclosure, will be more fully appreciated by reference to the following illustrative and non-limiting detailed description of example embodiments of the present disclosure, when taken in conjunction with the accompanying drawings. 
         FIG. 1A  shows an example of a charging kit, i.e. hearing device charger with one hearing device inserted therein in perspective according to an embodiment of the present disclosure. 
         FIG. 1B  shows an example of a charging kit, i.e. hearing device charger with two or a pair of hearing devices inserted therein in perspective according to an embodiment of the present disclosure. 
         FIG. 1C  shows an example of a charging kit, i.e. hearing device charger with no hearing devices inserted therein in an exploded view before or after disassembly according to an embodiment of the present disclosure. 
         FIG. 2A  shows the hearing device charger of  FIG. 1A  in a top plane view (towards top/upper surface/side of the hearing device charger) according to an embodiment of the present disclosure. 
         FIG. 2B  shows the hearing device charger of  FIG. 1B  in a top plane view (towards top/upper surface/side of the hearing device charger) according to an embodiment of the present disclosure. 
         FIG. 3A  shows a side view of the hearing device charger of  FIGS. 1A and 2A  in a direction from the left of  FIG. 1A  according to an embodiment of the present disclosure. 
         FIG. 3B  shows a side view of the hearing device charger of  FIGS. 1B and 2B  in a direction from the left of  FIG. 1B  according to an embodiment of the present disclosure. 
         FIG. 4A  shows a hearing device charger in a top plane view according to an embodiment of the present disclosure. 
         FIG. 4B  shows a hearing device charger in a top plane view according to an embodiment of the present disclosure. 
         FIG. 5A  shows a hearing device charger without hearing devices in a perspective top view (seen towards the top/upper surface/side of the hearing device charger) with exposed transmitter receiver elements according to an embodiment of the present disclosure. 
         FIG. 5B  shows a hearing device charger without hearing devices in a perspective top view (seen towards the top/upper surface/side of the hearing device charger) with no transmitter receiver elements exposed according to an embodiment of the present disclosure. 
         FIG. 6A  shows a perspective top view (towards the top/upper surface/side) of a part of a base charger of a hearing device charger (without any model specific insert) according to an embodiment of the present disclosure. 
         FIG. 6B  shows a side plane view in cross-section of a part of a hearing device charger (with a model specific insert) according to an embodiment of the present disclosure. 
         FIG. 6C  shows a side view in perspective in cross-section of a part of a hearing device charger (with a model specific insert) according to an embodiment of the present disclosure. 
         FIG. 7A  shows a side plane view of a cross-section of a part of a hearing device charger (with a model specific insert) according to an embodiment of the present disclosure. 
         FIG. 7B  shows a side plane view of a cross-section of a part of a hearing device charger (with a model specific insert) according to an embodiment of the present disclosure. 
         FIG. 7C  shows a side plane view of a cross-section of a part of a hearing device charger (with a model specific insert) according to an embodiment of the present disclosure. 
         FIG. 8A  shows a side plane view of a cross-section along line A-A in  FIG. 5B  of a hearing device charger (with a model specific insert) according to an embodiment of the present disclosure. 
         FIG. 8B  shows a side plane view of a cross-section along line B-B in  FIG. 5B  of the hearing device charger in  FIG. 8A  according to an embodiment of the present disclosure. 
         FIGS. 8C and 8D  show perspective views of parts of the base charger of the hearing device charger in  FIGS. 8A and 8B  (without any model specific insert) according to an embodiment of the present disclosure. 
         FIG. 9A  shows a perspective side view of a part in a base charger of a hearing device charger (without any model specific insert) according to an embodiment of the present disclosure. 
         FIG. 9B  shows a side view of a cross-section of the part in the base charger in a direction from the right to the left in  FIG. 9A  according to an embodiment of the present disclosure. 
         FIG. 10A  shows a perspective top view (seen towards the top/upper surface/side) of a part of a base charger of a hearing device charger (without model specific inserts) according to an embodiment of the present disclosure. 
         FIG. 10B  shows a side plane view in cross-section of a part of a hearing device charger (with a model specific insert) according to an embodiment of the present disclosure. 
         FIG. 11A  shows a perspective top view (seen towards the top/upper surface/side) of a part of a base charger of a hearing device charger (without model specific inserts) according to an embodiment of the present disclosure. 
         FIG. 11B  shows a side plane view in cross-section of a part of a hearing device charger (with a model specific insert) according to an embodiment of the present disclosure. 
         FIG. 12  shows a perspective top view (seen towards the top/upper surface/side) of a part of a base charger of a hearing device charger (without model specific inserts) according to an embodiment of the present disclosure. 
         FIG. 13A  shows a side view of a cross-section of a part in a base charger of a hearing device charger (without model specific inserts) according to an embodiment of the present disclosure. 
         FIG. 13B  shows a side view of a cross-section of the part in the base charger of  FIG. 13A  when a model specific insert is received or has been received in the base charger to form a hearing device charger according to an embodiment of the present disclosure. 
         FIG. 13C  shows a perspective top view (seen towards the top/upper surface/side) of the part of the base charger in  FIG. 13A  (without model specific inserts) according to an embodiment of the present disclosure. 
         FIG. 14  shows a side view of a part in a base charger of a hearing device charger (without model specific inserts) according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure will now be described with reference to the accompanying drawings  1 A to  14 , in which preferred example embodiments of the disclosure are shown. The disclosure may, however, be embodied in other forms and should not be construed as limited to the herein disclosed embodiments/examples. The disclosed embodiments are provided to fully convey the scope of the disclosure to the skilled person. Like reference numerals refer to like elements throughout. Like elements will, thus, not be described in detail with respect to the description of each figure. It should also be noted that the figures are only intended to facilitate the description of the embodiments. They are not intended as an exhaustive description of the claimed invention or as a limitation on the scope of the claimed invention. In addition, an illustrated embodiment needs not have all the aspects or advantages shown. An aspect or an advantage described in conjunction with a particular embodiment is not necessarily limited to that embodiment and can be practiced in any other embodiment/-s even if not so illustrated, or if not so explicitly described. Throughout, the same reference numerals are used for identical or corresponding parts. 
       FIGS. 1A to 3B  show a first aspect of this disclosure being a charging kit or assembly  1 , i.e. a hearing device charger, for charging one or more rechargeable hearing devices  100 ,  110 . The hearing devices could be one or a first hearing device  100  as in  FIGS. 1A, 2A and 3A  (shown before insertion of a second hearing device or before removing a first one already in the charging kit  1 ) and/or a first pair  100  of hearing devices as in  FIGS. 1B, 2B and 3B  (shown after insertion of two hearing devices or before removing one or both from the charging kit  1 ). The hearing devices could be another or a second hearing device  110  and/or a second pair  110  of hearing devices. The hearing devices could be a first hearing device  100  and/or a first pair  100  of hearing devices and/or a second hearing device  110  and/or a second pair  110  of hearing devices. In some embodiments, the first hearing device  100  is different from the second hearing device  110 . In some embodiments, the first pair of hearing devices  100  is different from the second pair of hearing devices  110 . In some embodiments, the first pair of hearing devices  100  comprises hearing devices that are different from each other. In some embodiments, the second pair of hearing devices  110  comprises hearing devices that are different from each other. In some embodiments, the first hearing device  100  and/or first pair of hearing devices  100  is different from the second hearing device  110  and/or the second pair of hearing devices  110 . The differences between hearing devices  100 ,  110  could be in size, shape, color, texture, functionality and/or type/model/generation, e.g. for adults or children. 
     The hearing device(s)  100 ,  110  is/are configured to be worn by a user. The hearing devices  100 ,  110  may comprise a processing unit configured to compensate for a hearing loss of the user of the hearing devices. The charging kit  1  comprises a base charger  10  configured to receive one or more model specific inserts  200 ,  210 . In some embodiments, the base charger  10  comprises one or more transmitter charging elements  11 . One or each hearing device  100 ,  110  comprises a BTE housing  103 ,  113  configured for placement behind the user&#39;s left or right ear, and at least one rechargeable battery  102 ,  112  for powering the hearing device  100 ,  110 . One or each hearing device  100 ,  110  may further comprise a hook or an ear plug  104 ,  114  configured for placement at least partly inside the user&#39;s left or right ear canal.  FIGS. 1A, 2A, 2B, 3A and 3B  show an ear plug  104 ,  114  comprising a receiver module.  FIG. 2B  shows an ear plug  104 ,  114  comprising a receiver module and a dome attached to a free end of the receiver module. In some embodiments, the base charger  10  comprises one or more transmitter charging elements  11  for each hearing device  200 ,  210 . Each model specific insert  200 ,  210  is adapted to removable receive at least one model specific hearing device  100 ,  110 , i.e. adapted to removably receive the BTE housing  103 ,  113  of the model specific hearing device  100 ,  110 . In some embodiments, each model specific insert  200 ,  210  is adapted to removable receive two or a pair of model specific hearing devices  100 ,  110 , i.e. adapted to removably receive the BTE housing  103 ,  113  of the two or pair of model specific hearing devices  100 ,  110 . A model specific hearing device  100 ,  110  comprises at least one receiver charging element  101 ,  111 . In some embodiments, each model specific hearing device  100 ,  110  comprises at least one receiver charging element  101 ,  111 . The transmitter charging element(s)  11  is/are configured to charge the hearing device(s)  100 ,  110  via the receiver charging element(s)  101 ,  111 . The base charger  10  comprises at least one cavity  12 , an attachment  13  for holding a model specific insert  200 ,  210 , a charger housing and a frame  16 ,  16 B that could be partly exposed or be arranged fully and non-exposed inside the charger housing of the base charger, see  FIGS. 1A to 1C, 3A, 3B, and 5A to 6C and 8A to 14 . The charger housing may comprise a top/upper surface or housing  14 , and a bottom/lower surface or housing  15 , see  FIGS. 1A to 1C, 2A, 2B, 3A, 3B, 5A, 5B, 6C, 8A and 8B . In  FIGS. 1A, 1B and 2A to 3B , each of the model specific hearing device(s)  100 ,  110  comprises at least one BTE housing  103 ,  113  and at least one hook or ear plug  104 ,  114 . The first hearing device(s)  100  comprises a first BTE housing  103  and a hook or ear plug  104 , see  FIGS. 1A .  1 B and  2 A to  3 B. The second hearing device(s)  110  comprises a second BTE housing  113  and a hook or ear plug  114 , see  FIGS. 2B and 3B . Each ear plug  104 ,  114  may be connected to a BTE housing  103 ,  113  via a tube and/or wire, see  FIGS. 1A and 2A to 3B . The ear plug  104 ,  114  may be connected to the BTE housing  103 ,  113  via the tube and/or wire at one end, see  FIGS. 1A and 2A to 3B , and the ear plug may be connected to a dome at the other end, see  FIG. 2B . 
     The transmitter charging element(s)  11  is/are arranged in the base charger  10  on an adjustable support  20  being configured to provide an adaptable positioning of the transmitter charging element, see  FIGS. 1C and 4A to 14 . The transmitter charging element(s)  11  may be supported by a support plate  11 A. The support plate  11 A may be made from a hard and/or brittle material. The support plate  11 A may be made from ferrite. The transmitter charging element  11  of the base charger  10  in the hearing device charger  1  is configured to be urged/bias towards a first model specific insert  200  when the first model specific insert is placed in and/or inserted into the base charger  10 . This enables energy to be transferrable from the transmitter charging element(s)  11  to the first receiver charging element(s)  101  of the first model specific hearing device  100  when the first model specific hearing devise, e.g. the BTE housing  103  of the first model specific hearing device, is placed in the first model specific insert  200  of the hearing device charger  1 . 
     In some embodiments, the same goes for a second model specific insert  210  in that the adjustable support(s)  20  of the transmitter charging element(s)  11  in the base charger  10  of the hearing device charger  1  is/are adapted to provide the adaptable positioning of the transmitter charging element(s), see  FIGS. 1C and 4A to 14 . The transmitter charging element  11  is configured to be urged/biased towards a second model specific insert  210  when the second model specific insert is placed in and/or inserted into the base charger  10 . As above, this enables energy to be transferrable from the transmitter charging element(s)  11  to the second receiver charging element(s)  111  of the second model specific hearing device  110  when the second model specific hearing device, e.g. the BTE housing  113  of the second model specific hearing device, is placed in the second model specific insert  210  of the hearing device charger  1 . 
     In some embodiments, the transmitter charging element(s)  11  is/are configured to be urged/biased or moved by being pushed and/or pulled in direction(s) towards the receiver charging element(s)  101 ,  111  of the model specific hearing device(s)  100 ,  110  for adapting to its/their different shape(s) and size(s) etc., see  FIGS. 1C and 4A to 14 . This is done for pressing the transmitter and receiver charging element(s)  11 ,  101 ,  111  with sufficient force towards each other to ensure correct distance(s) between them that provide secure and effective/reliable charging. In some embodiments, the charging element(s)  11 ,  101 ,  111  or at least the transmitter charging element(s)  11 , press/-es towards the associated model specific insert(s)  200 ,  210  or each other while not being in physical contact with each other. In some embodiments, the charging element(s)  11 ,  101 ,  111  press/-es against and in physical contact with the associated model specific insert(s)  200 ,  210  and/or each other. These directions, reference D, of urging and/or biasing and/or moving and/or pushing and/or pulling between different positions P, P 1 , and P 2  are visualized by dotted/solid lines and arrows and the different distances between these positions are referenced as d 1  and d 2  in  FIGS. 4A and 4B , and as D, P, P 1 , and P 2  in e.g.  FIGS. 5A, 5B, 6A to 6C, 7A to 7C, 8A to 8D, 9A to 9B, 10A to 10B, 11A to 11B, 12, and 13A to 13C . In  FIG. 14 , the urging or biasing or movement of the transmitter element  11  to adapt to different model specific inserts  200 ,  210  (not shown) and hearing devices  100 ,  110  (not shown) is done in such small scale by use of a compressible element(s)  23  of the adjustable support(s)  20 , such as rubber or foam in the form of a plate(s)/pad(s), e.g. made of Poron®, that no arrow visualises those small movements and changing distances and positions P, P 1 , and P 2  for the transmitter charging element(s)  11 . In this embodiment, the adjustable support(s)  20  may be the compressible element(s)  23 . In  FIGS. 1C, 6B, 6C, 7A to 7C, 8A, 8B, 10B, 11B, 13A , a vertical arrow in solid lines pointing down visualizes the movement of a model specific insert  200 ,  210  when inserted into or removed out in the opposite direction from the base charger  10 .  FIGS. 1A to 5B, 6B, 6C, 7A to 7C, 8A, 8B, 10B, 11B, 13B  show the model specific insert(s)  200 ,  210  when inserted, i.e. when received and/or assembled in the base charger  10  to form the hearing device charger  1 , this movement is principally applicable to all figs./embodiments when inserting or removing a model specific insert  200 ,  210 . 
     Each model specific insert  200 ,  210  comprises at least one model specific cavity  201 ,  211  configured to mate with at least one of the first or second model specific hearing devices  100 ,  110 , respectively, see  FIGS. 1A to 5B, 6B, 6C, 7A to 7C, 8A to 8B, 10B, 11B, and 13A to 13B . 
       FIG. 1C  shows the charging kit or assembly  1  when being assembled or at disassembly (vertical double arrows visualize the directions of assembly and disassembly and the directions of insertion and removal of the model specific insert(s)  200 ,  210 ). The components making up the base charger  10 , such as the frame  16 ,  16 B, the control unit  17  and the bottom housing  15  are in some embodiments, e.g. in  FIG. 1C , detachably connected by means of attachments  13 A, e.g. screws, but could also be connected via snap fit locking  13  or the like as shown in  FIG. 8B . In  FIG. 1C , the frame  16  comprises walls  16 B that define at least one cavity  16 A for receiving at least one model specific cavity  201 ,  211  of at least one model specific insert  200 ,  210 . In  FIG. 1C , the frame  16  is a stand or support for holding/attaching the adjustable support(s)  20  at one or more attachment points  21  and for enabling guiding and controlling the adjustability and movement of the adjustable support via one or more guides  27 . 
     In some embodiments, the base charger  10  comprises one or more cavities  12  configured to mate with or receive the first model specific insert  200  and/or the second model specific insert  210 , see  FIGS. 1C and 6A to 14 . The frame cavity(ies)  16 A are arranged inside or within these one or more cavities  12  of the base charger after assembly, see e.g.  FIGS. 1C  (after the top housing  14  is thread or placed over the frame  16  from above),  6 A,  6 B,  7 B,  8 A to  8 C,  10 A,  11 A,  11 B and  12 . Each model specific insert  200 ,  210  in all embodiments of the present disclosure is configured to be held in place in the base charger  10  after insertion therein to form the charging kit and hearing device charger  1  by means of at least one attachment  13 , see  FIGS. 1C and 8B . The attachment  13  could be a snap fit locking or screw or adhesive bonding or similar, see  FIGS. 1C and 8B . In  FIG. 1C , the attachment  13  is shown as a snap fit lock comprising one or more hook(s)  13  protruding from the first or second model specific insert  200 ,  210  and corresponding one or more catch(es)  13  in the top housing  14  of the base charger  10  configured for receiving and/or holding and/or retaining the hook(s)  13 . The model specific insert(s)  200 ,  210  is/are in some embodiments detachably attached to the frame  16 ,  16 B and/or the top housing  14  and/or the bottom housing  15  of the base charger  10 . 
     Each model specific insert  200 ,  210  comprises at least one model specific cavity  201 ,  211  configured to mate with the first or second model specific hearing device  100 ,  110 , respectively, see  FIGS. 1A to 5B, 6B, 6C, 7A to 7C, 8A to 8B, 10B, 11B, and 13A to 13B . This mating is preferably provided by molding the model specific insert(s)  200 ,  210  and the model specific cavity(ies)  201 ,  211  according to the associated hearing device(s)  100 ,  110 . A tolerance may be added to the model specific cavity  201 ,  211  in order to provide a loose fit of the model specific hearing aid(s)  100 ,  110  in the model specific cavity. In some embodiments, each model specific insert  200 ,  210  comprises two model specific cavities  201 ,  211  of which each model specific cavity  201 ,  211  is configured to mate with an associated one of the first model specific hearing devices  100  or to mate with an associated one of the second model specific hearing devices  110 . Commonly, each model specific cavity  201 ,  211  is configured to receive only one hearing device  100 ,  110 . In some embodiments (not shown), each model specific cavity  201 ,  211  is configured to receive two or more hearing devices, providing one common model specific cavity  201 ,  211 , e.g. as a twin cavity having two open and adjoining halves or spaces, one half space for each hearing device. In some embodiments, each model specific insert  200 ,  210  comprises two model specific cavities  201 ,  211  that pairwise is configured to mate with an associated pair of first model specific hearing devices  100  or to mate with an associated pair of the second model specific hearing devices  110 , see at least  FIGS. 1A to 5B . 
     In some embodiments, at least one of the first model specific hearing devices  100  and/or at least one of the second model specific hearing devices  110  and/or each of the hearing devices  100 ,  110  is configured for wireless charging, e.g. by means of inductive coupling, capacitive coupling, magnetic coupling, radio frequencies, light waves and/or sound waves, etc. In some embodiments, one or both or more or all of the first and the second model specific hearing devices  100 ,  110  is/are inductively chargeable. The transmitter charging element(s)  11  may in this disclosure be one or more transmitter coils and the receiver charging element(s)  101 ,  111  may be one or more receiver coils, such as one or more inductive transmitter coils and one or more inductive receiver coils. 
     In some embodiments, see  FIGS. 1B, 2B, 3B, 4A and 4B , the hearing device charger  1  is configured to comprise two model specific hearing devices  100 ,  110  inserted into the model specific insert  200 ,  210 . The transmitter charging element(s)  11  to the right in  FIGS. 4A and 4B  is arranged to be positioned at a start or base position Pin the cavity/-ies  12  of the base charger  10  before the first model specific insert  200  or the (different) second model specific insert  210  is placed in the base charger  10 . This start position P is shown in  FIGS. 4A, 4B, 5A, 5B, 6A, 7A, 8C, 8D, 9A, 9B, 10A, 11A, 12, 13A, 13C and 14  before insertion of any model specific insert  200 ,  210  in the base charger  10 . The same goes for the transmitter charging element(s)  11  to the left in  FIGS. 4A and 4B  but for simplicity only the change of positions of each transmitter charging element and direction D of displacement are visualized with single and double arrows and dotted and dashed lines in more detail by means of the right transmitter charging element(s)  11  of  FIGS. 4A and 4B , and in some detail for any of the transmitter charging element(s)  11  in  FIGS. 1C, 7A and 13A  to demonstrate the principle and functionality of the adjustable support(s)  20 . The transmitter charging element(s)  11  is/are configured to be displaced to a first position P 1  by the first model specific insert  200 . This enables the transmitter charging element(s)  11  to act with a bias/urging force towards the first model specific insert  200  when the first model specific insert is placed in the base charger  10 . The first position P 1  is different from the start or base position P. This first position P 1  is shown in  FIGS. 4A, 4B, 6B, 6C, 7A to 7C, 8A, 8B, 10B, 11B, 13B and 14 .  FIG. 4A  further shows how a first distance d 1  from the start position P to the first position P 1  may be shorter than a second distance d 2  from the start position P to the second position P 2 . However, in  FIG. 4A , the first distance d 1  from the start position P to the first position P 1  could be longer than the second distance d 2  from the start position P to the second position P 2 , hence, these distances d 1  and d 2  depend on the model specific insert(s)  200 ,  210 . In some embodiments, these distances are more than two distances, e.g. a third or fourth distance in same way as the positions could be more than two positions if more than two different model specific inserts  200 ,  210  were configured to be placed in the base charger  10  as the base charger  10  is adapted to receive more than two such different model specific inserts, one model specific insert at a time.  FIG. 4A  further shows how a symmetrical placement of two cavities  201 ,  211  in a model specific insert  200 ,  210  may be provided by means of the disclosed embodiments independent on which model specific insert is placed in the base charger  10 , e.g. independent on whether the first  200  or second model specific insert  210  or another model specific insert is placed in the base charger. This compared to  FIG. 4B  where positioning of the transmitter charging element(s)  11  and receiver charging element(s)  101 ,  111  in the base charger cavity is the same for all model specific insert. In  FIGS. 4A and 4B , the distances d 1  and d 2  and sizes of the transmitter charging element(s) are not to scale to be able to visualize the movements between different positions, such as from the start position P for a first model specific insert  200  urging the transmitter charging element(s)  11  away from the first model specific insert to a first position P 1  at a first distance d 1  being smaller than when a second model specific insert  210  is inserted into the base charger  10  and urging the transmitter charging element(s)  11  to a second position P 2  at a second distance d 2 . In embodiments of  FIGS. 13A to 13C , the model specific insert(s)  200 ,  210  when inserted into base charger  10  along the direction of the arrow pointing downwards, a lever  25  is pushed down urging the transmitter charging element(s)  11  towards the first model specific insert  200  to a first position P 1  at a first distance d 1  or towards the second model specific insert  210  to a second position P 2  at a second distance d 2 . 
     In some embodiments, the transmitter charging element(s)  11  is/are configured to be displaced to the first position P 1  to align with the first receiver charging element(s)  101  of the first model specific hearing device  100  when the first model specific hearing device is placed in the first model specific insert  200  in the base charger  10 . This enables the transmitter charging element(s)  11  to act with a bias or urging force towards the first model specific insert  200  and the first receiver charging element(s)  101  of the first model specific hearing device  100 . In some embodiments, the transmitter charging element(s)  11  is/are arranged to be positioned at the start position P in the cavity/-ies  12  of the base charger  10  before the second model specific insert  210  is placed in the base charger. The transmitter charging element(s)  11  is/are configured to be displaced to a first position P 1  or a second position P 2  by the second model specific insert  210 . This enables the transmitter charging element(s)  11  to act with a bias/urging force towards the second model specific insert  210  when the second model specific insert is placed in the base charger  10 . The first or second position P 1 , P 2  is different from the start position P. This first or second position P 1 , P 2  is shown in  FIGS. 4A, 4B, 5A, 5B, 6B, 6C, 7A to 7C, 8A, 8B, 10B, 11B, 13A to 13C and 14 . 
     In some embodiments, the transmitter charging element(s)  11  is/are configured to be displaced to the second position P 2  to align with the second receiver charging element  111  of the second model specific hearing device  110  when the second model specific hearing device is placed in the second model specific insert  210  in the base charger  10 . This enables the transmitter charging element(s)  11  to act with a bias or urging force towards the second model specific insert  210  and the second receiver charging element  111  of the second model specific hearing device  110 . The first or second position P 1 , P 2  is shown in  FIGS. 4A, 4B, 5A, 5B, 6B, 6C, 7A to 7C, 8A, 8B, 10B, 11B, 13A to 13C and 14 . In some embodiments, the first distance d 1  between the start position(s) P and the first position(s) P 1  is shorter, equal to or longer than the second distance d 2  between the start position(s) P and the second position(s) P 2 . The positions P, P 1  and P 2  are shown in  FIGS. 4A, 4B, 6A to 6C, 7A to 7C, 8A to 9B, 10A to 10B, 11A to 11B, 12, 13A to 13C and 14 . In some embodiments, another model specific insert, e.g. a third or fourth one displaces the transmitter charging element(s)  11  to the first position P 1  or the second position P 1  or to another position if placed in the base charger  10 , i.e. these positions are in some embodiments different for each model specific insert. The above enables maintaining the symmetry of the cavities  201 ,  211  in the base charger  10  even though differently shaped model specific inserts are placed therein. 
     In some embodiments, the adjustable support(s)  20  of the base charger  10  comprises one or more elastic elements  22  to make the transmitter charging element(s)  11  of the base charger movable between different positions P, P 1 , P 2  in the base charger. This enables the transmitter charging element(s)  11  to act with a bias/urging force towards or against or into contact with the first model specific insert  200  or the second model specific insert  210  when the first or second model specific insert is placed in the base charger  10 . In some embodiments, the elastic element(s)  22  of the adjustable support(s)  20  make the transmitter charging element(s)  11  of the base charger  10  movable between different positions P, P 1 , P 2  in the base charger when the first or second model specific hearing device  100 ,  110  is placed in the first or second model specific insert  200 ,  210 . This enables the transmitter charging element(s)  11  to act with a bias or urging force towards or against or into contact with the first receiver charging element  101  of the first model specific hearing device  100  when the first model specific hearing device is placed in the first model specific insert  200  in the base charger  10 , and also to act with a bias/urging force towards or against or into contact with the second receiver charging element  111  of the second model specific hearing device  110  when the second model specific hearing device is placed in the second model specific insert  210  in the base charger. 
     In some embodiments, see e.g.  FIGS. 6A to 6C, 7A to 7C, and 8A to 13C , the adjustable support  20  comprises an elongated body with a first free end  20 A and a second end  20 B opposite the first free end. Here, the transmitter charging element(s)  11  is/are arranged on the first free end  20 A of the adjustable support  20 . The support plate  11 A may be arranged between the transmitter charging element(s)  11  and the first free end  20 A. The transmitter charging element(s)  11  may be attached to the first free end  20 A via the support plate  11 A. In some embodiments, see e.g.  FIGS. 6A to 6C, 7C, 8A to 9B, 10A, 10B, 11A, 11B, 12, and 13A to 13C , the second end  20 B of the adjustable support  20  is attached to a guide  27  or attachment point  21  in the base charger  10 . Here, the first free end  20 A of the adjustable support  20  is arranged movable and/or displaceable in the cavity/-ies  12  of the base charger  10 . In some embodiments, the elongated body of the adjustable support  20  comprises or is the elastic or compressible element  22 ,  23 . 
     In some embodiments, see e.g.  FIGS. 6A to 12 , each adjustable support  20  comprises an elastic element  22  arranged at least partly between the first free end  20 A and the second end  20 B to exert a push force urging the first free end  20 A of the adjustable support and/or the transmitter charging element(s)  11  inside the base charger  10  in a direction being substantially in parallel with or in parallel with or inclined or substantially perpendicular or perpendicular to the direction of insertion of the first  200  and/or the second model specific insert(s)  210 . These directions may be guided by at least one guide  27  in which the elongated body of the adjustable support  20  is moved by being displaced or slid by the elastic element  22  urging or biasing the elongated body, see  FIGS. 1C, 6A to 6C, 7A to 7C, and 10A, 10B . 
     In some embodiments, see e.g.  FIGS. 6A to 6C , the elastic element  22  is located between the first free end  20 A and the second end  20 B of the adjustable support  20 , i.e. located between a first attachment point  21  at the second end  20 B in the form of a wall of the inner frame  16  of the base charger  10  and a second attachment point at the first free end  20 A in the form of a shoulder or collar  26  on the elongated body of the adjustable support, see  FIG. 6B . Here, the elastic element  22  of the adjustable support  20  is a helical spring arranged at least partly restrained between the shoulder  26  of the first free end  20 A and the attachment point  21  of the second end  20 B to be pre-tensioned to exert the bias or urging or pushing force towards the model specific insert(s)  200 ,  210 , which push force is directed to the left of  FIG. 6B , similar to the horisontal arrow in the elongated body of the adjustable support  20 . In some embodiments, e.g. in  FIGS. 6A and 6B , the helical spring  22  has one or first end  22 A supported at the first attachment point  21  and guided by a first guide  27  at this end to the right in the figs. and has another or second end  22 B to the left in these figs., which second end  22 B is supported and guided by the second attachment point being the shoulder  26  and a second guide  27 . The guides  27  provides control and stable movement for the elongated body and the helical spring  22  of the adjustable support  20  when being displaced back and forth in the urging direction D, i.e. away from or towards the model specific insert(s)  200 ,  210  when inserted into or removed from the base charger  10 . In some embodiments, at least one or each of the first and the second ends  22 A,  22 B of the helical spring  22  is/are attached to the first attachment point  21  and/or the second attachment point being the shoulder  26 , this is of advantage to not have to handle a loose spring if assembled together with the elongated body of the adjustable support but may worsen the functionality and life span of the spring  22  due to higher incurred strain at its end(s). 
     In some embodiments, in  FIGS. 6A to 6C and 8A to 13C , the transmitter charging element(s)  11  is/are supported or connected or attached to a holder  28 . The holder  28  is in some embodiments securely attached to or integrated in the first free end  20 A of the adjustable support  20  as in  FIGS. 6A to 6C, and 10A to 12  or an integrated part of the free end  20 A as in  FIGS. 8A to 9B and 13A to 13C . 
     This holder  28  has at least two functions, one being a support for the transmitter charging element(s)  11  and one being a protection against wear from the model specific insert(s)  200 ,  210  when inserted or removed from the base charger  10 . This wear protection of the holder  28  for the transmitter charging element(s)  11  is achieved in some embodiments by providing the holder with an outer protective frame or flange or edge  29  that could be straight or conical for enabling a loose fit at the beginning of the insertion of the model specific insert(s)  200 ,  210  and tighter fit the further down the model specific insert(s) are moved into the base charger  10  and while urging the transmitter charging element(s) away or towards itself/themselves. In some embodiments, the protective flange or edge  29  extends around the whole circumference of the transmitter charging element(s)  11  or at least partly around the circumference of the transmitter charging element(s)  11 . The protective flange or edge  29  may extend around the upper circumference of the transmitter charging element(s)  11  closer to the upper housing  14  of the base charger as seen e.g. in  FIGS. 9A and 9B  or extend at least partly around the circumference of the transmitter charging element(s)  11  with a shape similar to an upright U or horse shoe with its orifice or mouth directed upwards as seen e.g. in  FIGS. 8B, 8C, 8D, 10A, 11A, and 12  or an upside down U or horse shoe as seen e.g. in  FIG. 9A . In some embodiments, e.g. in  FIGS. 6A and 10A , the protective flange or edge  29  extends around the circumference of the transmitter charging element(s)  11  forming sides extending in substantially the same direction as the direction of insertion for the model specific insert(s)  200 ,  210 . In some embodiments, e.g. in  FIG. 6A , the protective flange or edge  29  extends around the circumference of the transmitter charging element(s)  11  forming sides extending in substantially the same direction as the direction of insertion for the model specific insert(s)  200 ,  210 , which sides  29  extends in one direction substantially vertical closer to the upper housing  14  of the base charger  10  and transcends into another direction at the end closer to the bottom housing  15  of the base charger in an inclined direction towards the first free end  20 A of the adjustable support  20 . 
     In some embodiments, see  FIGS. 6A and 6B , the spring  22  is configured to extend along the elongated body of the adjustable support  20  and to enclose or encompass or surround or cover at least a part of the outer surface of the elongated body of the adjustable support. The elongated body of the adjustable support  20  may be shaped like a cylindrical pin or be profiled with another elongated shape via extrusion. The cylindrical pin of the adjustable support  20  may be a solid or hollow cylindrical pin. The cylindrical pin of the adjustable support  20  is guided in the guide  27  of  FIGS. 6A and 6B  by sliding back and forth to the right or left in these figs. according to the horisontal double arrow visualizing the urging or pushing direction D when the model specific insert(s)  200 ,  210  is/are inserted into or removed from the base charger  10  as visualized by the vertical double arrow inside the model specific cavity/-ies  201 ,  211 . In some embodiments, see  FIG. 6C , the spring  22  is configured to extend along the elongated body of the adjustable support  20  but at least partly inside a channel or groove of the elongated body of the adjustable support. 
     In some embodiments, see e.g.  FIGS. 6A, 6B, 8A to 8C, and 10A to 12 , the first free end  20 A of the adjustable support  20  and/or the transmitter charging element(s)  11  are/is arranged at least partly in one or more insert cavities  16 A of the frame  16  of the base charger  10 . Each insert cavity  16 A is defined by one or more insert guides  16 B, such as one or more walls  16 B extending from the frame  16  of the base charger  10  or one or more surfaces  16 B of the frame  16  of the base charger  10 . The one or more insert guides  16 B may fully or partly enclose the respective model specific cavity  201 ,  211  as long as an orifice is provided for receiving the model specific insert(s)  200 ,  210  when introduced into the base charger  10 . The one or more insert guides  16 B of the base charger  10  may facilitate correct placement, i.e. guidance, of placement and alignment of the model specific insert(s)  200 ,  210  in the base charger  10 . 
     In some embodiments, the base charger  10  comprises one or more insert receiving cavities  16 A in which the model specific inserts  200 ,  210  with the model specific insert cavities  201 ,  211  are received. 
     In some embodiments, see  FIGS. 5A, 8A and 8B , the first free end  20 A of the adjustable support  20  is arranged at least partly in the model specific insert cavities  201 ,  211  and the insert receiving cavities  16 A of the base charger. In some embodiments, see  FIGS. 5A, 8A and 8B , the transmitter charging element(s)  11  is/are arranged at least partly in the model specific insert cavities  201 ,  211  and the insert receiving cavities  16 A of the base charger. In some embodiments, see  FIGS. 5A, 8A and 8B , the first free end  20 A of the adjustable support  20  and the transmitter charging element(s)  11  are arranged at least partly in the model specific insert cavities  201 ,  211  and the insert receiving cavities  16 A of the base charger. In some embodiments, see  FIGS. 5A, 6A, 6B, 8A to 8C, 10A, 10B, 11A, 11B and 12 , the first free end  20 A of the adjustable support  20  is arranged at least partly or fully in the insert receiving cavities  16 A of the base charger  10 . In some embodiments, see  FIGS. 5A, 6A, 6B, 8A to 8C, 10A, 10B, 11A, 11B and 12 , the transmitter charging element(s)  11  is/are arranged at least partly or fully in the insert receiving cavities  16 A of the base charger  10 . In some embodiments, see  FIGS. 5A, 6A, 6B, 8A to 8C, 10A, 10B, 11A, 11B and 12 , the first free end  20 A of the adjustable support  20  and the transmitter charging element(s)  11  are arranged at least partly or fully in the insert receiving cavities  16 A of the base charger  10 . 
     In some embodiments, see e.g.  FIGS. 1A, 2A, 5B, 6B, 7A to 7C, 10B, 11B, 13A, and 13B , the first free end  20 A of the adjustable support  20  and/or the transmitter charging element(s)  11  are/is arranged fully outside the model specific insert cavities  201 ,  211 . In some embodiments, see e.g.  FIGS. 5B, 6B, 7A to 7C, 10B, 11B, 13A, and 13B , the first free end  20 A of the adjustable support  20  and/or the transmitter charging element(s)  11  are/is arranged at least partly in or fully outside the model specific insert cavities  201 ,  211  and the insert receiving cavities  16 A of the base charger  10 . 
     In some embodiments, see e.g.  FIGS. 5A, 8A and 8B , the model specific cavity/-ies  201 ,  211  of the first or second model specific insert(s)  200 ,  210  each is defined by at least one insert cavity wall  202 ,  212  of the model specific insert and wherein each model specific cavity  201 ,  211  comprises one or more through holes  203 ,  213  through the insert cavity wall(s)  202 ,  212 . Hence, the first free end  20 A of the adjustable support  20  and/or the transmitter charging element(s)  11  are/is arranged at least partly in one or more of the through holes  203 ,  213  when any of the first or second model specific insert(s)  200 ,  210  is placed in the base charger  10 . 
     In some embodiments, see e.g.  FIG. 1C , the first and/or second model specific inserts  200 ,  210  may comprise one or more guide elements  204 ,  214  configured to support correct/controlled insertion of the first or second model specific insert  200 ,  210  into the base charger  10 . The guide elements  204 ,  214  may protrude from or be attached to or arranged on an bottom outer surface or bottom cavity wall  202 ,  212  and/or one or more side outer surface(s) or side cavity wall(s)  202 ,  212  of the one or more cavity/-ies  201 ,  211  of the model specific insert(s)  200 ,  210 . Outer surfaces of the cavity/-ies  201 ,  211  are the surfaces not facing and/or not being in contact with the model specific hearing aid(s)  100 ,  110  when inserted. Inner surfaces of the cavity/-ies  201 ,  211  are the surfaces facing and/or being in contact with the model specific hearing aid  100 ,  110  when inserted. 
     In some embodiments, see e.g.  FIGS. 6A, 6B, 10A, and 10B , the insert cavity(ies)  16 A comprise(s) one or more insert guides or one or more insert guide walls  16 B, wherein at least one of the insert guides or insert guide walls  16 B comprises one or more through holes  16 C in the insert guide or insert guide wall(s)  16 B, which through hole(s)  16 C is/are closed or fully surrounded by the insert guide(s) or insert guide wall(s)  16 B over the whole circumference of the hole  16 C, while in some embodiments, see e.g.  FIGS. 11A, and 12 , the through hole(s)  16 C is/are only partly closed or surrounded by the insert guide or insert guide wall(s)  16 B, i.e. holes are not closed, e.g. in  FIGS. 11A and 12 , the through holes  16 C are elongated through holes or slits through the thickness of the insert guide or insert guide walls  16 B extending all the way up to the edge or side of each insert cavity  16 A and the one or more insert guides or insert guide walls  16 B making the through holes  16 C into recesses, whereby, here, the adjustable support  20  is a part of the insert guide(s) or insert guide wall(s)  16 B. In some embodiments, see e.g.  FIGS. 6A, 6B, 10A, and 10B , the elongated body of the adjustable support  20  shaped like a cylindrical pin or profiled with another elongated shape via extrusion may be arranged in the through hole(s)  16 C. The elongated body of the adjustable support  20  shaped like a cylindrical pin may be configured to slide back and forth in the through hole  16 C in the direction D when the first or second model specific insert  200 ,  210  is inserted or removed from the base charger  10 . 
     In some embodiments, see e.g.  FIGS. 6B, 6C, 7A to 7C, 10B, and 13A to 13C , the first free end(s)  20 A of the adjustable support(s)  20  and/or the transmitter charging element(s)  11  are/is arranged fully outside one or more model specific insert cavities  201 ,  211  of the first or second model specific insert  200 ,  210 . 
     In some embodiments, see e.g.  FIGS. 7A to 7C and 8A to 12 , the elastic element  22  comprises at least one elastic arm similar to a leaf spring or the elastic element  22  is made up of at least one elastic arm or leaf spring. In some embodiments, see e.g.  FIG. 7A , the adjustable support  20  comprises the elastic arm(s) or leaf spring(s)  22  and the compressible element  23 , which together enable the adaptable positioning of the transmitter charging element(s)  11  being pressed against the compressible element  23  when the model specific insert(s)  200 ,  210  are placed in the base charger  10  and the elastic arm(s) or leaf spring(s)  22  enable a flexibility in the direction perpendicular to the direction of insertion (shown by the solid arrow) for the model specific insert(s)  200 ,  210  to provide an adaptable aligning of the transmitter charging element(s)  11  with the model specific insert(s)  200 ,  210  that are differently sized and/or shaped etc., see this visualized in dotted lines in  FIG. 7A  to show another model specific insert being displaced and inserted at another position, as positions P and P 1 , P 2  depending on the model specific insert(s)  200 ,  210 , the same positioning is applicable to  FIGS. 7B and 7C . 
     In some embodiments, see e.g.  FIGS. 7A, 7B and 7C , the model specific insert  200 ,  210  comprises guiding surfaces  27  that engage the adjustable support  20  when inserted into the base charger  10 , such that the transmitting charging element(s)  11  is/are biased or urged or pressed from the start/base position P towards the model specific insert(s)  200 ,  210  it-/themselves and/or the cavity wall  202 ,  212  of the model specific insert(s)  200 ,  210  and/or the receiver charging element(s)  101 ,  111  into the first or second position P 1 , P 2  enabling charging by the hearing device charger  1 . The guiding surfaces  27  act as supports in some embodiments to facilitate insertion and holding of the model specific insert(s)  200 ,  210  in proper fit, alignment and position. 
     In some embodiments, see e.g.  FIG. 12 , where the elastic element  22  comprises or is made up of at least two upright elastic elongated arms or thin plates similar to leaf springs arranged in a sandwiched or laminated manner. In some embodiments, see e.g.  FIGS. 7A to 9B, 10A, 10B, 11A, 11B, and 12 , the elastic element  22  is made of metal or plastic or any combination of those materials, the same goes for the elastic element  22  when being a helical and/or leaf spring. In some embodiments, the elastic element  22  is made as a double or twin or triple spring, e.g. a smaller helical spring within one or more larger helical springs and/or a metal elastic elongated arms or thin plates similar to leaf springs sandwiched over one or more other metal elastic elongated arms or thin plates similar to leaf springs and/or plastic elastic elongated arms or thin plates similar to leaf spring(s). In some embodiments, see e.g.  FIGS. 8A to 9B , the elastic elongated arms or plates similar to leaf spring(s)  22  has/have a first free end  20 A being made double, either “double-folded” or bent as in  FIGS. 8C and 8D  or shaped as a poker or hay- or pitchfork with two claws. In some embodiments, see e.g.  FIGS. 10A and 10B , a larger part of the elastic element  22 , here, also an elastic arm or thin plate similar to a leaf spring, is double-bent where a first upper part is attached to the elongated body of the adjustable support  20  to be able to bend while urging or biasing or moving or pushing or pulling the elongated body of the adjustable support  20  and at the same time moving the transmitter charging element  11  linearly towards or from the model specific insert(s)  200 ,  210  and/or the receiver charging element(s)  101 ,  111  as shown with the double arrow for urging direction D when placed therein as the elongated body is guided in guides  27  in the wall  16 B of the frame  16  and the frame at each end  20 A,  20 B of the elongated body. Hence, these double-shaped and bent first free ends  20 A of the elastic and elongated arm similar to leaf spring(s)  22  provides additional flexibility when the model specific insert(s)  200 ,  210  are inserted into the base charger  10  and thread past the adjustable support(s)  20  in a similar or same way as for all embodiments. 
     Hence, in some embodiments, the helical or leaf spring of the elastic element  22  is made of metal or plastic or any combination of those materials. 
     In some embodiments it is preferred that the elastic element  22  or at least parts of the elastic element  22  is made of metal, as metals are not exposed to creep (or permanent deformation over time due to an applied force), such as plastic materials may be. An elastic element  22  made of metal may thereby provide a more reliable bias or urging force urging the transmitter charging element(s)  11  against or towards one of the model specific inserts  200 ,  210  when the model specific insert is placed in the base charger  10 , this both over time and if a model specific insert with larger cavity/-ies  201 ,  211  is replaced with a model specific insert with smaller cavity/-ies so that the distance d 1 , d 2  the transmitter charging element(s)  11  is/are urged or bias becomes shorter.  FIGS. 6A to 6C  shows how the elastic element  22  may comprise a helical spring, which preferably may be made of metal.  FIG. 7C  shows an example of an elastic element  22  comprising an elastic arm which preferably may be made of metal.  FIG. 12  shows how the elastic element  22  may comprise both a metal plate and an elastic arm made of plastic. The metal plate  22  may be added to support the elastic arm  22  made of plastic, wherein the metal plate is the thinner plate (to the right in  FIG. 12 ) compared to the thicker elastic arm of plastic (to the left in  FIG. 12 ). 
     In some embodiments, see e.g.  FIGS. 11A to 12 , the first free end  20 A of the adjustable support  20  comprising the transmitter charging element  11  or the support plate  11 A comprises a hinged or pivotable part  24  connecting the transmitter charging element(s)  11  or the support plate  11 A to the first free end  20 A of the adjustable support  20  via a pivot or hinge connection  24 . In some embodiments, see e.g.  FIGS. 13A to 13C , the second end  20 B of the adjustable support  20  is pivotally attached to one or more attachments  21  of the frame  16  of the base charger  10  via one or more torsion hinges  24 . 
     In some embodiments, see e.g.  FIGS. 13A to 13C , the adjustable support  20  comprises a protruding member or arm or lever  25  arranged between the first free end  20 A and the second end  20 B. The adjustable support  20  may in this embodiment be an flexible arm being attached to the frame  16  of the base charger  10  by means of a hinge  24  and/or may be an elongated arm similar to a leaf spring protruding from or being attached to the frame  16  of the base charger  10 . The adjustable support  20  may define an axis extending from the first free end  20 A to the second end  20 B. The protruding lever  25  may extend along a longitudinal axis being perpendicular or approximately perpendicular to the axis between the first free end  20 A and the second end  20 B. The protruding lever  25  is configured to be engaged by a lower part or bottom of any of the first or second model specific insert(s)  200 ,  210  when any of the first or second model specific insert(s) is introduced into the base charger  10  as visualized by the solid arrow of  FIG. 13A  pointing downwards. Hence, the first free end  20 A is biased/urged with the transmitter charging element(s)  11  towards and/or against the model specific insert(s) and/or the associated receiver charging element  101 ,  111  by the protruding lever  25  working as a torque arm. 
     In some embodiments, see e.g.  FIGS. 7A and 14 , the adjustable support  20  comprises the compressible element  23  arranged at least partly between the first free end  20 A and the transmitter charging element  11  to provide a flexibility and/or a tolerance adaptability and/or to exert a bias force urging the first free end  20 A of the adjustable support and/or the transmitter charging element  11  away from each other, when the first or second model specific insert is not placed in the base charger  10 , and/or towards the first or second model specific insert  200 ,  210 , when the first or second model specific insert is placed in the base charger  10 , in a direction being substantially in parallel with or in parallel with or inclined or substantially perpendicular or perpendicular to the direction of insertion of the first model specific insert and/or the second model specific insert. In some embodiments, see e.g.  FIG. 7A , the adjustable support may comprise both the compressible element  23  and an elastic element  22 , such as a spring (e.g. the elongated arm similar to a leaf spring or a helical spring). The compressible element  23  may possibly be used in most of the embodiments of the present disclosure but in some embodiments, the compressible element  23  is not always necessary to use. 
     In some embodiments, see e.g.  FIGS. 6B, 8A and 8B , one or more weights  18  could be permanently fixed or integrated in the base charger  10  or be an optional entity and/or be a unit detachable from the base charger. The one or more weights  18  may preferably be arranged in the bottom part or bottom housing  15  of the base charger  10  to ensure stability of the hearing device charger  1  when standing on a table or any other substantial flat surface, so that the hearing device charger  1  do not tilt when subjected to a minor push or the like. 
     The hearing device charger  1  may comprise one or more control units  17  for controlling the functionality of the charging by being operatively connected to other components of the hearing device charger  1 , the base charger  10  and its transmitter charging element(s)  11 . The hearing device charger  1  and base charger  10  comprises one or more conduits or wiring for operative connection, e.g. electrical wiring or conduits  19 , between the control unit  17  and the transmitter charging element(s)  11  and/or any other associated component required for control and powering of the charging. The electrical wiring  19  is in some embodiments accomplished by loose wiring to enable the flexibility and movement of the transmitter charging element(s)  11  when adapting to the different model specific insert(s)  200 ,  210  and/or the model specific hearing device(s)  100 ,  110 . The control unit  17  for controlling the hearing device charger  1  is operatively connected to all necessary components, such as electronics and/or electronic circuits and mechanical devices incl. electrical switches, relays, integrated circuits, conduits, external power applications providing power to the hearing device charger  1  etc. However, these entities working together for the operation of the hearing device charger  1  are possible to implement by use of many different types of components and parts being common knowledge for a skilled person and are therefore not explained in detail herein. The control and charging control unit  17  for controlling the hearing device charger  1  and its charging are in some embodiments operatively connected to one or more built-in and rechargeable batteries to safely operate the hearing device charger  1  and/or charge the battery/-ies  102 ,  112  in each hearing device  100 ,  110  when the hearing device charger  1  is not connected to an external power source. 
     In some embodiments, the elastic element  22  works as or is a biasing organ. 
     In some embodiments, the transmitter charging element(s)  11  inside the cavity/-ies  12  of the base charger  10  is/are positioned and/or moved and/or displaced by one or more forces exerted by the insertion of the first model specific insert(s)  200  and/or the second model specific insert(s)  210  and/or by insertion of a third or fourth model specific insert  200  and/or fifth second model specific insert  210  or more. 
     In some embodiments, the base charger  10  is adapted to removable receive the first model specific insert(s)  200  having/for the first model specific hearing device(s)  100  to enable replacing the first model specific insert(s) with the second (and different) model specific insert(s)  210  having/for the second model specific hearing device(s)  110  comprising the second receiver charging element(s)  111 . 
     In some embodiments, see e.g.  FIGS. 6A to 6B , the adjustable support  20  comprises an elastic element  22  being a helical spring made of metal and the elongated body is a cylindrical pin or axle extending through the helical spring  22  giving better guidance/control of the movement for the adjustable support and the transmitter charging element(s)  11 . This as the helical spring  22  made of metal is not exposed to creep (or permanent deformation over time due to an applied force) in the same manner as a plastic spring might be and the movement of the helical spring is guided/controlled by the cylindrical pin extending through the helical spring. 
     The person skilled in the art realizes that the present disclosure is not limited to the preferred embodiments described above. The person skilled in the art further realizes that modifications and variations are possible within the scope of the appended claims. Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed disclosure, from a study of the drawings, the disclosure, and the appended claims. The specification and drawings are, accordingly to be regarded in an illustrative rather than restrictive sense. The claimed invention is intended to cover all alternatives, modifications and equivalents. 
     Items 
     Item 1. A charging kit  1  for charging one or more rechargeable hearing devices  100 , 110 , the hearing device(s) being configured to be worn by a user, the charging kit comprising a base charger  10  being configured to receive a first model specific insert  200 , the base charger comprising a transmitter charging element  11 , where the first model specific insert is adapted to removably receive at least a first model specific hearing device  100  of the one or more hearing devices, the first model specific hearing device comprising a first receiver charging element  101 , characterized in that the transmitter charging element  11  is arranged in the base charger  10  on an adjustable support  20  being configured to provide an adaptable positioning of the transmitter charging element, whereby the transmitter charging element is configured to be urged towards the first model specific insert when the first model specific insert is placed in the base charger thereby enabling energy to be transferrable from the transmitter charging element to the first receiver charging element  101  of the first model specific hearing device  100  when placed in the first model specific insert.
 
Item 2. The charging kit  1  according to item 1, the base charger  10  being configured to receive a second model specific insert  210 , wherein the second model specific insert is adapted to removably receive at least a second model specific hearing device  110  of the one or more hearing devices, the second model specific hearing device comprising a second receiver charging element  111 , and wherein the adjustable support  20  of the transmitter charging element  11  is adapted to provide the adaptable positioning of the transmitter charging element, so that the transmitter charging element is configured to be urged towards the second model specific insert  210  when the second model specific insert is placed in the base charger enabling energy to be transferrable from the transmitter charging element to the second receiver charging element  111  of the second model specific hearing device  110  when the second model specific hearing device is placed in the second model specific insert.
 
Item 3. The charging kit  1  according to any preceding item, wherein the base charger  10  comprises a cavity  12  configured to mate with the first model specific insert  200  and/or the second model specific insert  210 , and/or each model specific insert comprises at least one model specific insert cavity  201 ,  211  configured to mate with the first or second model specific hearing device  100 ,  110 , respectively.
 
Item 4. The charging kit  1  according to any preceding item, wherein the first and/or second model specific insert  200 ,  210  comprises two model specific insert cavities  201 ,  211  of which each model specific insert cavity  201 ,  211  is configured to mate with one of a pair of the first model specific hearing devices  100  or to mate with one of a pair of the second model specific hearing devices  110 .
 
Item 5. The charging kit  1  according to any preceding item, wherein at least one of the first model specific hearing devices  100  and/or at least one of the second model specific hearing devices  110  is configured for wireless charging.
 
Item 6. The charging kit  1  according to any preceding item, wherein one or more or all of the first and/or the second model specific hearing devices  100 ,  110  is/are inductively chargeable.
 
Item 7. The charging kit  1  according to item 3 or any of items 4 to 6 when dependent on item 3, wherein the transmitter charging element  11  is arranged to be positioned at a start position Pin the cavity  12  of the base charger  10  before the first model specific insert  200  is placed in the base charger, and the transmitter charging element is configured to be displaced to a first position P 1  by the first model specific insert and to act with a urging force towards the first model specific insert  200  when the first model specific insert is placed in the base charger, the first position P 1  being different from the start position P.
 
Item 8. The charging kit  1  according to item 7, wherein the transmitter charging element  11  is configured to be displaced to the first position P 1  to align with the first receiver charging element  101  of the first model specific hearing device  100 , when the first model specific hearing device is placed in the first model specific insert  200  in the base charger  10 , and to act with a urging force towards the first model specific insert  200  and the first receiver charging element of the first model specific hearing device.
 
Item 9. The charging kit  1  according to item 7 or 8, wherein the transmitter charging element  11  is arranged to be positioned at the start position P in the cavity  12  of the base charger  10  before the second model specific insert  210  is placed in the base charger, and the transmitter charging element  11  is configured to be displaced to a second position P 2  by the second model specific insert and to act with a urging force towards the second model specific insert when the second model specific insert is placed in the base charger, the second position P 2  being different from the start position P.
 
Item 10. The charging kit  1  according to item 9, wherein the transmitter charging element  11  is configured to be displaced to the second position P 2  to align with the second receiver charging element  111  of the second model specific hearing device  110 , when the second model specific hearing device is placed in the second model specific insert  210  in the base charger  10 , and to act with a urging force towards the second model specific insert and the second receiver charging element of the second model specific hearing device.
 
Item 11. The charging kit  1  according to any of items 7 to 10, wherein the first distance d 1  between the start position P and the first position P 1  is shorter, equal to or longer than the second distance d 2  between the start position P and the second position P 2 .
 
Item 12. The charging kit  1  according to any of items 1 to 11, wherein the adjustable support  20  comprises an elastic element  22  configured to make the transmitter charging element(s)  11  of the base charger  10  movable between different positions P, P 1 , P 2  in the base charger and able to act with a urging force towards or against or into contact with the first model specific insert  200  or the second model specific insert  210  when the first or second model specific insert is placed in the base charger.
 
Item 13. The charging kit  1  according to item 12, wherein the elastic element  22  of the adjustable support  20  make the transmitter charging element(s)  11  of the base charger  10  movable between different positions P, P 1 , P 2  in the base charger, when the first or second model specific hearing device  100 ,  110  is placed in the first or second model specific insert  200 ,  210  in the base charger, and able to act with a urging force towards or against or into contact with the first receiver charging element of the first model specific hearing device, when the first model specific hearing device is placed in the first model specific insert  200  in the base charger, and able to act with a urging force towards or against or into contact with the second receiver charging element of the second model specific hearing device, when the second model specific hearing device is placed in the second model specific insert  210  in the base charger.
 
Item 14. The charging kit  1  according to any of items 3 to 13, wherein the adjustable support  20  comprises an elongated body with a first free end  20 A and a second end  20 B opposite the first free end, whereby the transmitter charging element  11  is arranged on the first free end  20 A of the adjustable support and the second end  20 B of the adjustable support is attached to a guide  27  or attachment point  21  in the base charger  10 , and the first free end of the adjustable support is arranged movable/displaceable in the cavity  12  of the base charger  10 .
 
Item 15. The charging kit  1  according to item 14 and item 12, wherein the elongated body of the adjustable support  20  comprises or is the elastic element  22 .
 
Item 16. The charging kit  1  according to item 14, wherein the adjustable support  20  comprises an elastic element  22  arranged at least partly between the first free end  20 A and the second end  20 B to exert a push force urging the first free end of the adjustable support and/or the transmitter charging element(s)  11  inside the base charger  10  in a direction being substantially perpendicular or perpendicular to the direction of insertion of the first model specific insert  200  and/or the second model specific insert  210 .
 
Item 17. The charging kit  1  according to any of items 14 to 16, wherein the base charger  10  comprises one or more insert receiving cavities  16 A, whereby the first free end  20 A of the adjustable support  20  and/or the transmitter charging element(s)  11  are/is arranged at least partly in or fully outside the insert receiving cavity/-ies  16 A of the base charger  10 .
 
Item 18. The charging kit  1  according to any of items 14 to 17, wherein each of the model specific insert cavities  201 ,  211  of first or second model specific inserts  200 ,  210  is defined by an insert cavity wall  202 ,  212 , wherein each insert cavity  201 ,  211  comprises one or more through holes  203 ,  213 , wherein the first free end  20 A of the adjustable support  20  and/or the transmitter charging element(s)  11  are/is arranged at least partly in one or more of the through holes when one of the first and/or second model specific inserts is placed in the base charger  10 .
 
Item 19. The charging kit  1  according to any of items 16 to 18 when item 17 or 18 depends on item 16, wherein the elastic element  22  of the adjustable support  20  is arranged at least partly restrained between the first free end  20 A and the second end  20 B to be pre-tensioned to exert the urging force.
 
Item 20. The charging kit  1  according to any of items 14 to 19 when dependent on item 12 or 16, wherein the elastic element  22  is configured to extend along the elongated body of the adjustable support  20  and to enclose or encompass or surround or cover at least a part of the outer surface of the elongated body of the adjustable support.
 
Item 21. The charging kit  1  according to any of items 12 to 20 when items 17 to 19 depend on item 12, wherein the elastic element  22  comprises at least one helical spring or at least one leaf spring or the elastic element is made up of at least one helical spring or at least one leaf spring.
 
Item 22. The charging kit  1  according to any of items 12 to 21 when item 17 or 18 depends on item 12 or 16, wherein the elastic element(s)  22  comprise(s) or is/are made up of at least two leaf springs arranged in a sandwiched or laminated manner.
 
Item 23. The charging kit  1  according to any of items 12 to 22 when item 17 or 18 depends on item 12 or 16, wherein the elastic element(s)  22  is/are made of metal or plastic or any combination of those materials.
 
Item 24. The charging kit  1  according to any of items 21 to 23, wherein the helical or leaf spring of the elastic element  22  is made of metal or plastic or any combination of those materials.
 
Item 25. The charging kit  1  according to any of items 14 to 24, wherein the first free end  20 A of the adjustable support  20  comprising the transmitter charging element(s)  11  is a hinged or pivotable part  24  of the elongated body of the adjustable support.
 
Item 26. The charging kit  1  according to any of items 14 to 25, wherein the transmitter charging element  11  is connected to the first free end  20 A of the adjustable support  20  via a pivot or hinge  24 .
 
Item 27. The charging kit  1  according to any of items 14 to 26, wherein the adjustable support  20  comprises a protruding member or arm or lever  25  arranged between the first free end  20 A and the second end  20 B, the protruding member being configured to be engaged by any of the first or second model specific insert  200 ,  210  when any of the first or second model specific insert is introduced into the base charger  10 , whereby the first free end and the transmitter charging element(s)  11  are urged towards the model specific insert.
 
Item 28. The charging kit  1  according to item 27, wherein the second end  20 B of the adjustable support  20  is pivotally attached to the frame  16  of base charger  10  via a torsion hinge  24 .
 
Item 29. The charging kit  1  according to any of items 14 to 28, wherein the adjustable support  20  comprises a compressible element  23  arranged at least partly between the first free end  20 A and the transmitter charging element  11  to provide a flexibility and/or a tolerance adaptability and/or to exert a urging force urging the first free end of the adjustable support and/or the transmitter charging element  11  away from each other and/or towards the first or second model specific insert  200 ,  210 , when the first or second model specific insert is placed in the base charger, in a direction being substantially perpendicular or perpendicular to the direction of insertion of the first model specific insert and/or the second model specific insert.
 
     LIST OF REFERENCES 
     
         
           1 : Charging kit/assembly/device.  10 : Base charger with housing.  11 : Transmitter charging element of base charger.  11 A: Support plate.  12 : Cavity/-ies of base charger.  13 : Attachment/-s for attaching model specific inserts to base charger.  13 A: Attachment/-s of base charger for holding of parts making it up.  14 : Top housing of base charger.  15 : Bottom housing of base charger.  16 : Frame of base charger.  16 A: Insert cavity.  16 B: Insert guide/Insert guide wall.  16 C: Through hole(s) of insert guide/insert guide wall  16 B.  17 : Operational device/Controller/Control unit of base charger comprising electronics, e.g. one or more printed circuit boards, power supplies, conduits, switches etc.  18 : Weight that could be permanently fixed or integrated in the base charger or be an optional entity and/or be a unit detachable from the base charger.  19 : Conduits to/from controller  17 . 
           20 : Adjustable/Adaptable support/structure of transmitter charging element.  20 A: First free end of adjustable/adaptable support/arrangement  20 .  20 B: Second end of adjustable or adaptable support/arrangement  20 .  21 : Attachment point of support  20 .  22 : Elastic element of the adjustable support, such as an elastic arm, a spring (e.g. a helical spring made of plastic or metal) or a leaf spring.  22 A: First end of helical spring  22 .  22 B: Second end of helical spring  22 .  23 : Compressible element of the adjustable support, such as rubber or foam in the form of a plate/pad, e.g. made of Poron®, or just a hard or stiff spacer or the like or part of the support being hard or stiff.  24 : Hinge/Pivot of adjustable support, e.g. a living hinge or torsion hinge.  25 : Protruding arm/lever of adjustable support.  26 : Shoulder on support  20 .  27 : Guide of support  20 .  28 : Holder of transmitter charging element  11 .  29 : Flange/edge of holder  28 . 
           100 : First model(s)/group(s) specific hearing device(s).  101 : First receiver charging element.  102 : Rechargeable battery of the first hearing device(s)  100 .  103 : BTE housing of the first hearing device(s)  100 .  104 : Hook or ear plug of the first hearing device(s)  100 . 
           110 : Second model(s)/group(s) specific hearing device(s).  111 : Second receiver charging element.  112 : Rechargeable battery of the second hearing device(s)  110 .  113 : BTE housing of the second hearing device(s)  110 .  114 : Hook or ear plug of the second hearing device(s)  110 . 
           200 : First model(s)/group(s) specific insert.  201 : Model specific cavity/-ies of first model(s)/group(s) specific insert.  202 : Cavity wall(s) of cavity/-ies  201 .  203 : Through hole(s) of cavity wall(s)  202 .  204 : Guide element(s) of first model(s)/group(s) specific insert. 
           210 : Second model(s)/group(s) specific insert.  211 : Model specific cavity/-ies of second model(s)/group(s) specific insert.  212 : Cavity wall(s) of cavity/-ies  211 .  213 : Through hole(s) of cavity wall(s)  212 .  214 : Guide element(s) of second model(s)/group(s) specific insert. 
         D: Direction of urging of the transmitter charging element  11 . P: Start position of transmitter charging element. P 1 : First position of transmitter charging element. P 2 : Second position of transmitter charging element. d 1 : First distance. d 2 : Second distance.