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So you can charge on mains, as long as you watch on battery? What if you use a wireless charger while watching? Does that count as connected?

Or for that matter, how about a human-powered charger, or even a device powered by its own nuclear energy source[1]?

Yes. Unless you’re on transportation.

Also a useful loophole to get around the license required to sell alcohol, as demonstrated by Tom Scott in a hovercraft: https://m.youtube.com/watch?v=ZLF7yife8YE