Features: This Rechargeable Battery Pack is the Perfect addition to Any Xbox 360 Wireless Controller.  Simply Pop the Battery Pack into your Controller and you'll Never have to Worry about Buying & Replacing AA Batteries ever Again. Upgrade your Xbox 360 Wireless Controller Battery Green LED Indicator Shows Power Connected Only Never Run out of Battery when you are in the Middle of Games Battery Can be Charged Through any USB Port Fits Directly into Controller Battery Compartment When the Battery is Running out of Power, you Just need to Simply insert the Chargeable Battery into your Wireless Controller and there will never be a need to Replace the Battery again. To Charge the Battery Pack Simply Connect it to the USB Port on the XBOX 360 Specifications: Capacity: 4800mAh Battery Output DC 2.4V Initial Charge Time : 4 Hours Supplied with USB Charging Cable Cable Length: 1M Compatible Models: For Xbox 360 & Xbox 360 Slim Wireless Controller Package Includes: 1x Rechargeable Battery USB Charging cable