Replaced PS3 controller battery with old cell phone battery to avoid buying new controller. Should I be worried? It's not pretty, but it seems to work fine takes a charge again! :
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Amazon.com: PS3 Controller Rechargeable Battery Pack : Video Games
AccuCell Akku passend für Sony PS3 SIXAXIS Wireless-Controller Akku LIP1859, CS-SP130SL, LIS1359, LIP1472 | PS3 SIXAXIS Controller | Sony | Akku für PDA, MP3 & Co | Akkus | Akkushop-Austria
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Buy PlayStation 3 PS3 Controller Rechargeable Battery Pack | eStarland.com
Replacement Battery compatible with Sony Playstation 3 Controller - Insten
Repair: Replacing a dead PS3 Dualshock 3 controller battery – Darian Cabot
EXTREMELY rough battery upgrade mod, for my favorite PS3 controller : r/PS3