Baghdad battery

Today batteries can be found in any grocery, drug, convenience and department store you come across. Well, here's a battery that's 2,000 years old! Known as the Baghdad Battery, this curiosity was found in the ruins of a Parthian village believed to date back to between 248 B.C. and 226 A.D. The device consists of a 5-1/2-inch high clay vessel inside of which was a copper cylinder held in place by asphalt, and inside of that was an oxidized iron rod. Experts who examined it concluded that the device needed only to be filled with an acid or alkaline liquid to produce an electric charge. It is believed that this ancient battery might have been used for electroplating objects with gold. If so, how was this technology lost... and the battery not rediscovered for another 1,800 years?