I am relatively new to hearing aids. It seems that the default primary cell is a zinc-air cell. Output is at1.4 or 1.45 volts. The size designatgion is 312.
My hearing aids came with rechargeable cells. I am not sure what the specs for these secondary cells are difficult to find. My guess is that they are NiMH cell with a nominal output of 1.2 volts. I am not all that familiar with such cells. Ahain, I am guessing that these secondary cell when fully charged measure 1.3 to 1.35 volts before settling to a lower voltage. Does anyone have enough knowledge or experience to let me know just what is used for secondary cells.
The charger charges these cell inductively. That is, there is no electrical connection from the charger to the cell. The coupling is magnetic to the hearing aid assembly itself. Any rectification is in the hearing aid itself.