@user207 This is semi-hidden Hearing Aid Self-Fitting and Adjusting [DIY]) category
where we can discuss DIY openly.
Rechargeable HAs as backups have some issues. The Lion batteries need conditioning if you plan to store them. Also buying used rechargeable HAs from EBay may require battery replacement in the near future. Do you know how difficult (or costly) that is?
Tip: Click any PVC Avatar to find DIY School.
Suggested DIY School reading;
- Buying Rechargeable Hearing Aids