I'm not trolling. I'll summarize in three points and stop replying because I think we're talking past each other and it's a waste of our time.

1. The use in phones is a silly illustration. You can ignore phones. No one in this thread specified a form factor or power output requirement except you to bring up counter examples for an argument I'm not even proposing.

2. The math you did makes sense, but doesn't disqualify this conceptually as a generator. Even if it's of laughably small power that's literally all I said was it's just a small generator.

3. The use of the terminology of battery is misleading, these are small power generators. It's not a scam until someone says it's useful for X, where X is someone it's not useful for. We agree on all the X so far.

That's it. Cheers.