Another option if planning for the long term, would be a return to the old technology of wet Leclanche cells.
Very interesting - thanks! I've been musing about home-made cells for a long time, primarily for LED lighting. I can make electrolyte (lye) from wood ash (mostly KOH I guess) ... what could I scrounge in order to kludge together a nickel-iron Edison cell? Or something better?
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