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! :
How To: replace PS3 controller battery with like for like or upgrade it to a lithium polymer battery - YouTube
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Replacement Battery compatible with Sony Playstation 3 Controller - Insten
Do It Yourself] How to change a DualShock 3 internal batteryPS3Blog.net
Increase PS3 Sony Controller Battery Size - YouTube
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Replacing a PlayStation 3 (PS3) DualShock Controller Battery Review - www.impulsegamer.com -
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PlayStation 3 Controller Battery | 1800 mAh | Hand Held Legend