Adjustable article of furniture comprising at least one adjustable element and an actuator system for adjusting the adjustable element , where the actuator system comprises: at least one electrically driven linear actuator , and possibly also a driven drive wheel , an electrical controller with an operation device , connection means for a power supply via mains, a power supply in the form of a battery pack with rechargeable batteries of a first type, characterized in that the actuator system is equipped with a frontend as interface for the battery pack , where the frontend: - enables the battery pack to be equipped with a second type of rechargeable batteries than the first type of rechargeable batteries, which to the actuator system still appears as a battery pack containing the first type of rechargeable batteries, - comprises a charging circuit configured to adapt the charging voltage, i.e. both up and down, with a view to supplying the battery pack with an appropriate voltage for charging the battery pack , - during idle periods, where the current draw is below a given threshold, adapts an output voltage corresponding to the output voltage, which a battery pack of the first type with the same remaining capacity would have, - when a current running out of this exceeds a predetermined threshold, regulates the output voltage, such that the controller is supplied directly with the output voltage of the battery pack . at least one electrically driven linear actuator , and possibly also a driven drive wheel , an electrical controller with an operation device , connection means for a power supply via mains, a power supply in the form of a battery pack with rechargeable batteries of a first type, characterized in that the actuator system is equipped with a frontend as interface for the battery pack , where the frontend: - enables the battery pack to be equipped with a second type of rechargeable batteries than the first type of rechargeable batteries, which to the actuator system still appears as a battery pack containing the first type of rechargeable batteries, - comprises a charging circuit configured to adapt the charging voltage, i.e. both up and down, with a view to supplying the battery pack with an appropriate voltage for charging the battery pack , - during idle periods, where the current draw is below a given threshold, adapts an output voltage corresponding to the output voltage, which a battery pack of the first type with the same remaining capacity would have, - when a current running out of this exceeds a predetermined threshold, regulates the output voltage, such that the controller is supplied directly with the output voltage of the battery pack . - enables the battery pack to be equipped with a second type of rechargeable batteries than the first type of rechargeable batteries, which to the actuator system still appears as a battery pack containing the first type of rechargeable batteries, - comprises a charging circuit configured to adapt the charging voltage, i.e. both up and down, with a view to supplying the battery pack with an appropriate voltage for charging the battery pack , - during idle periods, where the current draw is below a given threshold, adapts an output voltage corresponding to the output voltage, which a battery pack of the first type with the same remaining capacity would have, - when a current running out of this exceeds a predetermined threshold, regulates the output voltage, such that the controller is supplied directly with the output voltage of the battery pack . <EOS>