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! :
2X Replacement Battery Pack + USB Charger Cable For SONY PS3 CECHZC2E Controller | eBay
Replacement Battery Pack for Sony Playstation 3 PS3 Controller by Insten - Walmart.com
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2 wireless controller batteries for Sony PS3 Bluetooth controller|Batteries| - AliExpress
Replacement Sony PS3 Sixaxis Controller Battery (3.7V, 1.4Ah, Li-Ion) | Battery Mart
LIS1442 Battery for Sony PS3 Playstation 3 Move Navigation Controller
PlayStation 3 Slim PRAM Battery Replacement - iFixit Repair Guide
Repair: Replacing a dead PS3 Dualshock 3 controller battery – Darian Cabot
Buy PlayStation 3 PS3 Controller Rechargeable Battery Pack | eStarland.com
impulsegamer.com - Replacing the battery in a PS3 DualShock Controller - impulsegamer.com
1800mAh Replacement Battery for Sony PS3 CECHZC2U Controller Battery Replacement, Compatible with Sony Playstation Gold Wireless Headset and Dual Shock 4 PS4 CUH-ZCT1U Controllers
Amazon.com: PS3 Controller Rechargeable Battery Pack : Video Games
Battery for Sony PlayStation Move Motion Controller, Motion Controller, CECH-ZCM1E , PS3 Move (not suitable for PS4 Move)