@IGZO With above photos, could you evaluate the voltage and current capacity of the gadget. As the LiPO battery of CC has a 300 times cycle (charging), it is good for approximately one year usage.
Then most of the assisted hearing device of hearing aids is good for 1 year usage and then you need to change the battery or need a power bank to supplying the power. Take a look at this forum:-
Phonak Roger On switch repair guide - Hearing Aid Forum - Active Hearing Loss Community
Your comments or advice would help a lot to those using assisted Hearing device.