A lifting device for lifting an object, wherein the lifting device comprises: a casing arranged to be displaced when the lifting device is operated to lift the object, a string mounted within the casing and extending out of the casing, wherein the casing is suspendable by means of the string, and wherein the lifting device is arranged to adjust a length of the string extending out of the casing to achieve a movement of the casing, and a maneuverer member, connected to the casing and arranged to provide sensing signalling representative of a direction of the movement of the casing when the lifting device is operated, wherein the casing comprises: a control unit arranged to control, based on the sensing signalling, the length of the string extending out of the casing, and an electric motor arranged to be controlled by the control unit to cause the movement of the casing, wherein the lifting device is arranged to adjust the length of the string extending out of the casing by that the electric motor is arranged to wind-up or un-wind the string, and wherein the lifting device further comprises: a battery arranged to power the electric motor, wherein the battery is arranged to accompany the casing when displaced, wherein the casing has an opening, wherein the casing is arranged to hold the battery to obscure the opening when the battery is releasably mounted in the casing, characterized in that when the battery is released from the casing, the opening provides access to the string and any parts inside the interior of the casing that may cooperate with the string or that are in the vicinity of the string. a casing arranged to be displaced when the lifting device is operated to lift the object, a string mounted within the casing and extending out of the casing, wherein the casing is suspendable by means of the string, and wherein the lifting device is arranged to adjust a length of the string extending out of the casing to achieve a movement of the casing, and a maneuverer member, connected to the casing and arranged to provide sensing signalling representative of a direction of the movement of the casing when the lifting device is operated, wherein the casing comprises: a control unit arranged to control, based on the sensing signalling, the length of the string extending out of the casing, and an electric motor arranged to be controlled by the control unit to cause the movement of the casing, wherein the lifting device is arranged to adjust the length of the string extending out of the casing by that the electric motor is arranged to wind-up or un-wind the string, and wherein the lifting device further comprises: a battery arranged to power the electric motor, wherein the battery is arranged to accompany the casing when displaced, wherein the casing has an opening, wherein the casing is arranged to hold the battery to obscure the opening when the battery is releasably mounted in the casing, characterized in that when the battery is released from the casing, the opening provides access to the string and any parts inside the interior of the casing that may cooperate with the string or that are in the vicinity of the string. a control unit arranged to control, based on the sensing signalling, the length of the string extending out of the casing, and an electric motor arranged to be controlled by the control unit to cause the movement of the casing, wherein the lifting device is arranged to adjust the length of the string extending out of the casing by that the electric motor is arranged to wind-up or un-wind the string, and wherein the lifting device further comprises: a battery arranged to power the electric motor, wherein the battery is arranged to accompany the casing when displaced, wherein the casing has an opening, wherein the casing is arranged to hold the battery to obscure the opening when the battery is releasably mounted in the casing, characterized in that when the battery is released from the casing, the opening provides access to the string and any parts inside the interior of the casing that may cooperate with the string or that are in the vicinity of the string.