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! :
2 wireless controller batteries for Sony PS3 Bluetooth controller|Batteries| - AliExpress
Repair: Replacing a dead PS3 Dualshock 3 controller battery – Darian Cabot
Dual Pro Professional Series Battery Charger PS3 - Pro Fishing Supply
Amazon.com: Pickle Power PS3 Controller Battery Replacement, 2 Pack LIP1359 Battery for Sony Playstation 3 PS3 Dualshock 3 CECHZC2E CECHZC2U Controller with USB Cable+Tools : Video Games
3.7v 1800mah Rechargeable Replacement Battery For Ps3 Game Controller Battery Pack For Ps3 Gamepad - Batteries - AliExpress
Replacement Battery compatible with Sony Playstation 3 Controller - Insten
Battery Replacement for Sony PS3 Dualshock Wireless Controller CECHZC2E CECHZC2U | eBay