[cobbzilla]

You had me until you said electricity. That implies metal, and we certainly have the tools to find metal that old, but have found nothing crafted by homo anything, afaik. Would it all be too buried? One would imagine that somewhere some evidence would have surfaced. But iirc oldest metalworking is from ~11kya

[sethammons]

you can make a tiny battery with ancient-style materials. It’s essentially a vinegar (or lemon juice) galvanic cell using copper and iron inside a porous clay jar. People often call this the “Baghdad battery"

[adgjlsfhk1]

the problem with these hypotheses is the lack of wiring. a very simple battery is not difficult to make (but pay no attention to the energy density), but making a useful circuit that does anything is pretty hard. the simplest possible useful circuit is a lightbulb which requires ability to create tungston wire, a vacuum, and very thin, precise glass.

[nkrisc]

But what would you even use that for? What large-scale practical application is there for such a device?