If you figure the average AA battery is 1.2 volts, then it's okay to assume the Xbox Core controller requires a minimum of 2.4 volts, giving an average of 2,100mAh per battery pack in this kit.

That's just what Evil Controllers is attempting with a new set of mods that are designed to make the Xbox 360 controller more comfortable and integrates a rechargeable battery that should keep you ...

That's just $5.85 per battery pack. As a comparison, the official Micorosoft Play & Charge Kit will run you $25, and that is for a single battery pack. Two Xbox Controller Battery Packs for $11.69 ...