No more worrying about losing power during game play! dreamGEAR's Xbox 360 Power Kit Includes a Charging Cable, a Rechargeable Battery and a Charging Dock. The Charging Cable lets you play games while charging up the battery. When you notice your Rechargeable Battery getting low, take out the old battery, put it into the Charging Dock and slide in a fresh one. Problem solved.
Microsoft Xbox 360 Wireless Controller