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The Baghdad Battery is the name given to a set of three artifacts which were found together: a ceramic pot, a tube of copper, and a rod of iron. It was discovered in present-day Khujut Rabu, Iraq, close to the metropolis of Ctesiphon, the capital of the Parthian and Sasanian empires, and it is believed to date from either of these periods.
Its origin and purpose remain unclear. It was hypothesized by Wilhelm König, the director of the National Museum of Iraq, that the object functioned as a galvanic cell, possibly used for electroplating, or some kind of electrotherapy, but there is no electroplated object known from this period, and the claims are near universally rejected by archaeologists. An alternative explanation is that it functioned as a storage vessel for sacred scrolls.