Reader, [Fox9p3400], opened up an Xbox 360 controller battery pack so we could all see what goes into one. It contains two Sanyo 2100mAh NiMH AA rechargeables (Model HR-3U 1.2V). In addition to ...

The Xbox Controller Battery Pack features dual 4800mWh batteries, fast charging, and comprehensive power capabilities. This battery pack delivers reliable performance with modern features.

Your controller disconnects, your Xbox becomes unresponsive, and the controller won't turn back on — Nothing ruins a great gaming session like finding out your controller batteries are dead.