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Frog battery - A frog battery is an electrochemical battery consisting of a number of dead frogs (or sometimes live ones), which form the cells of the battery connected in a series arrangement. It is a kind of biobattery. https://en.wikipedia.org/wiki/Frog_battery
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Obviously they didn't have PETA back in the 19th century. =p ‎· ronin
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Also ox head, eel, pigeon and rabbit batteries. ‎· ronin
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