Originally Posted by Quoth
Any fruit or vegetable acid or other acid. It's the pair of dissimilar metals plus an acid electrolyte that gives the electricity, not the lemon.
Or you could use low tech solar power. Burn willow to make steam that rotates paddles on a motor. The vibrator in some phones is motor with an offset weight on the shaft. That might be useable as small hand-cranked, water, steam, wind or tidlal powered generator.
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