This is a battery that is 2000 years old. No one is actually sure what it was for (they didn’t have electricity like we do) but they believe it WAS in fact a battery.
The jar was found in Khujut Rabu just outside Baghdad and is composed of a clay jar with a stopper made of asphalt. Sticking through the asphalt is an iron rod surrounded by a copper cylinder. When filled with vinegar – orany other electrolytic solution – the jar produces about 1.1 volts.