Abstract
The present invention relates to a hearing device (1) comprising at least a signal processing unit (3) and at least a fuel cell (4) to supply the signal processing (3) unit with energy. The fuel tank of the fuel cell (4) comprises a membrane (5) or an area with micro openings to let the fluid or gas to be used by the fuel cell (4) pass into the fuel tank and to block other fluids from entering the fuel tank.
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