Oddly enough, I was watching Star Wars the untold story (I think that was the name) and they talked about Darth Vaders suit and how it would be powered. One theory that's not far fetched is that there are batts. you can pee on to charge. As for right now... My tooth brush recharges wirelessly technically.
http://www.splashpower.com/How on Earth do you charge a laptop wirelessly?