Wii U Battery Dissection and Improvement | BitBuilt - Giving Life to Old Consoles
1pc 3.7V 3600mAh Rechargeable Li ion Battery Pack for Nintendo Wii U Gamepad Battery for Wii U Wiiu GamePad Controller Joystick|Batteries| - AliExpress
Amazon.com: OSTENT 3.7V 1500mAh Rechargeable Battery Pack Replacement for Nintendo Wii U Gamepad : Video Games
Wii U GamePad Battery Replacement - iFixit Repair Guide
Nintendo Support: How to Remove, Reseat, or Replace the Battery in a Wii U GamePad