Bought it as a spare to always have one battery ready to play while charging the 2nd one. I charged it twice without any problems with myXbox 360 Quick Charge Kitand on the third time I noticed the lights on the charging Kit wouldn't turn on, as in there wasn't any battery in it. Left it overnight without the charging kit lights on but just as I suspected it didn't charge one bit. I've googled a lot trying to find a solution but haven't found one. What I did find was that other customers have the same charging problem. Very dissapointed.EDIT: Forgot to mention, I also experienced what other reviewers have written. This battery is a bit larger than the original microsoft one and it has to be forced a little bit into the controller. I didn't pay much attention to this the two times I used it because I was happy that it was working properly. Have read in other pages that in time it can actually break the controller so also take this into consideration before buying this product.