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! :
DualSense Controller v1 Repair - iFixit
Geekria Replacement Joystick Repair Kit, Metal Buttons for DualShock 4, Controller Repair Kits with Tool for Playstation 5, Playstation 4, PS4 Slim, PS4 Pro, CUH-ZCT2 Controller (Black) - Walmart.com
Fix Any Video Game Controller : 9 Steps (with Pictures) - Instructables
For Ps3 Controller Conductive Rubber Soft Rubber Silicon Conductive Button Pad Replacement 5pcs - Accessories - AliExpress