Method for determining an aging condition of a battery cell in a hearing instrument

A method for ascertaining a state of health of a battery cell used in a hearing instrument, the method comprising:

• for each of a plurality of charging cycles:
• ascertaining by a battery manager of the hearing instrument a transferred charge that is transferred to the battery cell;
• ascertaining by the battery manager a number of charging characteristic values that provide information about the change in a state of charge of the battery cell brought about by the transferred charge;
• and
• ascertaining, on a basis of the transferred charge and the number of charging characteristic values, a capacity characteristic value that forms a characteristic variable for a present charging capability of the battery cell;
• with a signal processor of the hearing instrument or a signal processor of an assistive device associated with the hearing instrument, averaging at a given point in time respective capacity characteristic values of at least some of ten previous charging cycles, and calculating therefrom an averaged charging capacity;
• and
• comparing the averaged charging capacity with a reference value that forms a characteristic variable for an original capacity of the battery cell, and determining therefrom the state of health of the battery cell.