Li-po and Li-Ion battery for the Xbox 360 controller. – S-Config
3 in 1 battery kit for Xbox 360 Wireless Controller – Generations The Game Shop
Compatible with Xbox 360 Battery Pack, Rechargeable Battery Pack 4800mah Replacement Battery Pack and Charging Kit for Xbox 360 : Amazon.ca: Video Games
xbox 360 battery pack" 3D Models to Print - yeggi
How to Make a Spare Controller Battery Pack for Xbox 360 : 9 Steps - Instructables