Xbox 360 Controller No Battery Pack Fix - Use Your Controller Without a Battery Pack - YouTube
Xbox 360 Wireless Controller Teardown - iFixit
How to Make a Spare Controller Battery Pack for Xbox 360 : 9 Steps - Instructables
Amazon.com: 2800mAh Rechargeable Controller Battery Pack for Xbox One/Xbox Series X/Xbox One S/Xbox One X/Xbox One Elite, Rapthor 4 x 2800 mAh High Power NI-MH Batteries Kit with Charger (4 Batteries+Charger) :
Li-po and Li-Ion battery for the Xbox 360 controller. – S-Config
Xbox 360 Controller USB Cord Replacement - iFixit Repair Guide