Frog battery
![Matteucci's frog battery, 1845 (top left); Aldini's frog battery, 1818 (bottom); apparatus for controlled exposure of gases to frog battery (top right).](/Images/godic/202501/28/Matteucci's_frog_battery_trimmed22722.jpg")
![Bird's diagram of a frog battery, 1848](/Images/godic/202501/28/Frog_battery_from_Bird2722.jpg")
![Aldini's 1803 ox-head battery.](/Images/godic/202501/28/Aldini's_ox_battery2722.jpg")
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.