Abstract: A hearing device has a battery module. The battery module has a secondary cell and a reception coil for contactless charging of the secondary cell. The battery module has a circuit board with a conductor track which forms the reception coil. The circuit board contains a plurality of layers. The conductor track extends over the plurality of layers while containing a conductor loop, which has at least one turn, in each of the plurality of layer. A corresponding circuit board is furthermore specified.

Abstract: A charging coil for a hearing aid charger for magnetic resonance charging of a hearing aid. The charging coil has a printed circuit board coil and a frame shaped ferrite tile with a central opening for receiving and securing the hearing aid. The printed circuit board coil is arranged on the frame shaped ferrite tile.

Abstract: A method includes connecting a device to a charger and providing wireless charging in a state of charge by transferring energy wirelessly from a transmitter module of the charger to a reception module of the device. The device has a state of discharge in which energy is consumed. The device includes a charging connector, to which a charging input voltage adjustable by the charger is applied for charging. The device includes a switching connector for turning the device on and off. The device includes a switch connected to the switching connector and being switchable by the charging input voltage by setting the charging input voltage to an intermediate voltage. The charger sets the charging input voltage to the intermediate voltage for switching the switch and transitioning the device into an off state with the device turned off. A corresponding device and charger are also provided.

Abstract: A battery module for a hearing device is configured for inductive resonance charging. The battery module has a secondary cell, a blocking sleeve that encloses the secondary cell and shields the secondary cell against a magnetic field, a jacket formed from permeable material outside the blocking sleeve, and an induction coil outside the jacket for receiving energy inductively. The induction coil and the jacket form a receiving antenna for receiving the energy. The material and/or the geometric structure of the blocking sleeve, the jacket made of permeable material, and/or the induction coil is/are additionally selected in such a way that the battery module, in particular the induction coil, has a quality factor of at least 35 for receiving energy at a predetermined value of a charging frequency that is employed by a charging device that generates a magnetic alternating field.

Abstract: A hearing device has a battery module. The battery module has a secondary cell and a reception coil for contactless charging of the secondary cell. The battery module has a circuit board with a conductor track which forms the reception coil. The circuit board contains a plurality of layers. The conductor track extends over the plurality of layers while containing a conductor loop, which has at least one turn, in each of the plurality of layer. A corresponding circuit board is furthermore specified.

Abstract: A battery module for a hearing device is configured for inductive resonance charging. The battery module has a secondary cell, a blocking sleeve that encloses the secondary cell and shields the secondary cell against a magnetic field, a jacket formed from permeable material outside the blocking sleeve, and an induction coil outside the jacket for receiving energy inductively. The induction coil and the jacket form a receiving antenna for receiving the energy. The material and/or the geometric structure of the blocking sleeve, the jacket made of permeable material, and/or the induction coil is/are additionally selected in such a way that the battery module, in particular the induction coil, has a quality factor of at least 35 for receiving energy at a predetermined value of a charging frequency that is employed by a charging device that generates a magnetic alternating field.