seen these on a random site the other week, Really pee's me of when i put the wiimotes in a carry case to take round a mates house, when i get there, both dead. Found out they turn on everytime you press a button.
I figured they would be smart enough to give the Wiimote a self charging off the console like the 360. Guess not, seems ill have to pick one of these up when i snag a Wii.