In 1936 in the village of Khuyut Rabbou'a , near Baghdad , Iraq ; a collection of objects belonging to Parthian era (2000 years ago) was discovered by a German archeologist Wilhelm König and later it was called Parthian battery. This battery consists of a clay pot (protective cover), an iron rod (anode - negative pole) and a copper cylinder (cathode- positive pole) sticking through asphalts. Researchers believe that  copper sulfate ,wine, lemon juice , grape juice , or vinegar was used as...
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