I'd imagine that this isn't an example of perpetual motion because I'd imagine that the battery would run out eventually, but I'm still surprised it's lasted this long. I'd imagine this isn't a convenient way of storing a lot of energy or a lesser amount of energy due to it's extremely bulky size and I'd imagine that the battery would drain a lot quicker if it was hooked up to a more energetic process that consumed more electrical energy. Which is probably why we still aren't at the point of small batteries necessary to keep modern touchscreen smartphones running for more than a few hours (which will probably be rectified soon...).