Battery, which is 2,000 years old. This finding, known as the battery of Baghdad, dated to between 248 and 226 BCE. The device consists of a 5.5-inch clay vessel, which houses a copper cylinder, fortified asphalt, with oxidized iron bar inside. We study the experts came to the conclusion that for the production of electric current unit requires only in acidic or alkaline filling. It is believed that this ancient battery might be used for electroplating gold. But this technology was lost and the battery has disappeared from the face of the earth for 1,800 years.