The Purpose of the Parthian Galvanic Cells: A First-Century A.D. Electric Battery Used for Analgesia
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Paul Keyser argued in the Journal of Near Eastern Studies that the copper/iron assemblies were intentional galvanic cells, proposing analgesic electrotherapy rather than electroplating as their function.
This is the strongest serious positive case and prevents a blanket Contradicted verdict.
Qualifies
The artifact geometry can be made electrochemically active in reconstruction if an electrolyte and circuit are supplied, but that does not establish what liquid, connections or purpose existed in antiquity.