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.
The principle behind the battery is the injury potential created in a muscle when it is damaged, although this was not fully understood in the 18th and 19th centuries; the potential being caused incidentally due to the dissection of the frog's muscles.
The frog battery is an example of a class of biobatteries which can be made from any number of animals. The general term for an example of this class is the muscular pile.
The first well-known frog battery was created by Carlo Matteucci in 1845, but there had been others before him. Matteucci also created batteries out of other animals, and Giovanni Aldini created a battery from ox heads.
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