“He has shown drawings using electric eels in tanks as batteries.”
My friend in Cairo showed me a sketch that looked like an eel, but he did not tell me the origin of the sketch. I found a reference to ancient Eyptianb tomb markings similar.
Electric catfish, Malapterurus electricus
https://www.scotcat.com/factsheets/malapterurus_electricus.htm
“This is certainly a catfish for the experienced catfish keeper as it is like no other, and when adult the electric organ is capable of generating 300-400 volts, enough to stun a full grown adult of Homo sapian!. When they are bought, usually as small juveniles, their electrical output is more of a tingle.”
“This is an old world catfish and it is reputed that Doctors in ancient Egypt used shocks from the Electric Catfish to reduce the pain of arthritis. This trait is still used today in some areas. It also has the earliest reference of them as hieroglyphics on the walls of ancient Egyptian tombs dating back some 5000 years.”
Also see my post #25