Xbox 360 controller rechargeable battery cover. 3D printed on my Anet A8 : r/3Dprinting
TTX Tech Rechargeable Battery Pack 3900mAh for Xbox 360 Controller – Gametronex.com
Xbox 360 2 Pack Rechargeable Battery Pack 3600mAh + Dual Charging Station Dock Stand Base (Black) for Xbox 360 Wireless Controller[Xbox 360] - Walmart.com
How to replace XBox 360 Wireless Controller Batteries -Both Types - YouTube
Xbox 360 Controller No Battery Pack Fix - Use Your Controller Without a Battery Pack - YouTube
For Xbox 360 Wireless Controller 2 Pack Rechargeable Battery with Dual Charging Station Dock Stand Base (Power Kit includes 2pcs 3600mah High Capacity Controller Batteries and Docking Charger) - Walmart.com
Xbox 360 controller - Wikipedia
Li-po and Li-Ion battery for the Xbox 360 controller. – S-Config
Insten For Xbox 360 Controller Battery Pack Charger Station with 2 Rechargeable Battery Charging Dock for Microsoft Xbox360 Remote Controller - Walmart.com
Li-po and Li-Ion battery for the Xbox 360 controller. – S-Config
I just dug up my old Xbox 360 and found it to somehow work, only problem I had was that the controllers battery compartment looks like this and the controller doesn't turn
Rechargeable Battery Pack X Xbox 360 Gamepad Controller Control Xbox360 Game - Batteries - Aliexpress