Electrochemistry: From Baghdad Battery to Alexander Volta

Alexander Volta has been the inventor of the battery since the 19th century, while archaeological finds in parts of Iran and Iraq show that it was about 2,000 years before Volta (200 BC). Battery was made in Iran during the Parthian period.
The Parthian Battery, known worldwide as the Parthian Battery and sometimes as the Baghdad Battery, was discovered in 1936 by Wilhelm Koenig in the Khajeh Rabo area near Baghdad, near the ancient city of Ctesiphon. The hypotheses presented by archaeologists have all confirmed that this set of batteries was made for electrochemical applications, including metal plating, and the discovery of plated vessels near the site of the discovery of this battery confirms this; A finding that in turn indicates a historical scientific leap! But what exactly is a fuel cell?