Before you step into the final chamber of the deep, dark dungeon ahead, you stop and contemplate your adventure — you've fought, cast spells and made all the right choices for several hours in order to make it to this point. Only one challenge remains, and if you can defeat the massive and terrifying monster behind that door, you will conquer the game. Thanks to the Rechargeable Battery Pack attached to your Xbox 360 Wireless Controller, you know that you'll have enough power to crush your enemy.Stop frantically searching through drawers or fumbling with disposable batteries when the juice runs out on your Xbox 360 wireless controllers. Each Rechargeable Battery in this 2-Pack keeps your controller powered and ready to go for up to 40 hours of thrilling gameplay. The convenient batteries are compatible with official Xbox 360 accessories, including Wireless Controllers, Quick Charge Kit and the Play and Charge Kit. You've honed and mastered your skills, now make sure you have the power to defeat any foe that crosses your path.