I've put in some serious time on my xbox360, and a month after launch, I'm still on my original batteries that came with the controllers. I look at the health of the batteries on the screen, and it only shows 1 bar depleted. This is amazing. Now, of course it could just be that I'm an awesome and efficient gamer, but seriously, I thought I would be replacing these things like crazy. I don't even have the play and charge kit.