2-Pack Rechargeable 3600mAh Battery Pack for Xbox 360 Wireless Remote Controller - Black by Insten - Walmart.com
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
Xbox 360 rechargeable battery pack, 電子遊戲, 遊戲機配件, 充電綫及充電器- Carousell
Amazon.com: 2 Pack Rechargeable Battery with Dual Charging Station Dock for Xbox 360 Controller : Video Games
Amazon.com: Xbox 360 Wireless Controller - Glossy Black : Video Games
Best Buy: Microsoft Rechargeable Battery Pack for Xbox 360 Controller (Blue) B4U-00021