FYI if you use disposable CI/HA batteries:
MEDICAL DEVICE ALERT - from MHRA (Medicines and Healthcare products regulatory Agency)
All ZeniPower mercury free hearing aid and cochlear implant batteries - low risk of batteries exploding during use or if depleted.
Do not use batteries with a best before date of '08-2018' and '09-2018'. This date is on the outer blister packaging.
For more information: https://www.dropbox.com/s/ya8jrbnirqvqykb/MDA-2016-003_final%20Zhuhai%20Zhi%20Li%20Battery%20Co%20Ltd.pdf?dl=0