>>3677325Lately I've been using LR44 buttons which I have first "degraded" with LED to lower the voltage. Downside is, I have to constantly check that the voltage hasn't drop too much in use. I probably next time buy zinc-air (hearing aid) batteries which have right voltage out of the box. Because the modern batteries are too small, I've made my own battery holder from cardboard and tape to hold the smaller batteries.
