I've heard about that. I fancy myself a skeptic, but it is true. There is little evidence they ever found a use for it, but ancient, like thousands of years old ancient batteries have been discovered. Simple, but electricity nonetheless. I'm not sure I believe in the stories about how this was given to them by aliens from the stars, but it is interesting to think about. And this also begs the question. What would they use such technology for? As a matter of fact, how would they even know of its existance? Without electronic technology, I am having trouble figuring at least that part out. It is possible. I don't believe it, but then again, greater minds than my own do. Also, since this is a forum on science and aliens, there are other questions. What about the building of the pyrimids? some of these things do suggest greater discussion. Oh, and I just figured out what they might've used the batteries for. Electro magnets. We know that they had a concept of loadstones, and they knew that iron could be magnetized, so...
Now, the question then becomes, how did they learn it? You already know my answer, I am a skeptic. (Said the man who authored a forum on the Supernatural) I believe it was just...deductive reasoning. But, what do you think? I do enjoy these topics.