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Frog battery
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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. It was used in early
scientific investigations of electricity and
academic demonstrations.
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Matteucci's frog battery, 1845 (top left);
Aldini's frog battery, 1818 (bottom); apparatus
for controlled exposure of gases to frog
battery (top right).