EEEkit 2-Pack AA Battery Pack Cover for Xbox 360 Controller, Black - Walmart.com
Li-po and Li-Ion battery for the Xbox 360 controller. – S-Config
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Insten For Xbox 360 Controller Battery Pack Charger Station with 2 Rechargeable Battery Charging Dock for Microsoft Xbox360 Remote Controller - 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