To power my exposure meter and give my photographs a hope in hell of working, my OM-1n needs a Mercury battery - unfortunately these batteries got banned for being, I don't know, a bit deadly - so now us old-school Oly shooters need a workaround. Step in the 675 Zinc-air hearing aid battery, which I'm told promises to be just as effective to within a bit of a stop.
More here at Silverbased.org
