If your loop system on your hearing aid doesn't seem to be working, check the building you are in has it switched on.
Hearing Aids Battery Size 312
Size 312 Hearing Aid Batteries
Size 312 Hearing Aid Batteries are used mostly by hearing aids sold privately and is very occasionally used in the NHS for certain hearing aids that provide amplification for mild hearing losses. (last approx 7 days). You can find a list of hearing aids that fit Size 312 Hearing Aid Batteries below.