Hearing instrument with power supply unit, and power supply unit for a hearing instrument

A hearing instrument, comprising:

• a hearing instrument body housing;
• at least one microphone and a receiver mounted on or in said housing;
• an earpiece and an earpiece connector or a sound tube;
• a signal processing unit connected to said at least one microphone and said receiver;
• a power supply unit including a rechargeable power supply and a control and monitoring device;
• a switching device configured to assume at least two switching states;
• said control and monitoring device controlling a switched-off state of the hearing instrument as a function of a switching state of said switching device;
• said switching device including a first part, which is arranged on a first component of the hearing instrument, and a second part which is arranged on a second component of the hearing instrument, and wherein the switching state of said switching device is changeable via a relative movement between the first component of the hearing instrument and the second component of the hearing instrument;
• a sealing device and an activatable limiting device;
• wherein, in an activated state, the relative movement between the first component of the hearing instrument and the second component of the hearing instrument is limited by said limiting device, and the switching device is sealed in an open switching state due to a limitation of the relative movement by said limiting device and by said sealing device;
• and wherein said switching device is sealed in a closed switching state by said sealing device;
• said switching device configured to control said control and monitoring device.