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
Obviously they didn't have PETA back in the 19th century. =p ‎- ronin
Also ox head, eel, pigeon and rabbit batteries. ‎- ronin