I have recently been fitted with a single Oticon Spirit Zest BTE aid which the manual says should take size 13 or 312 batteries. I have just had to replace the original 13 battery and thought that I would try a 312 as I have a pack spare. However, the 312 would not work and I had to fit another 13 battery.
Can anyone tell me why the 312 will not work. Could it be something to do with the size and not making electrical contact? I don’t want to get involved in opening up the aid to bend the contacts.
All advice gratefully received.