How to Install a High Capacity Battery for Wii U Gamepad - YouTube
Extended Battery Pack for Wii U GamePad – Retro Raven Games
1pc 3.7V 3600mAh Rechargeable Li ion Battery Pack for Nintendo Wii U Gamepad Battery for Wii U Wiiu GamePad Controller Joystick|Batteries| - AliExpress
KMD Wii U Gamepad Internal Expended Battery Pack 3000MaH for Wii U Gam – Gametronex.com
New 3600mAh 3.7V Rechargeable Extended Battery Pack For Nintendo Wii U Gamepad | eBay
Extended Battery for Wii U Gamepad (installed) | Wii u, Wii, Nintendo wii
I bought the extended Gamepad battery. I see Nintendo planned a spot for it all along. : r/wiiu
Amazon.com: Hisewen Wii U Gamepad Battery, 2200mAh Replacement Rechargeable Battery Pack for Nintendo Wii U Gamepad WUP-012, WUP-010 : Video Games