I bought the extended Gamepad battery. I see Nintendo planned a spot for it all along. : r/wiiu
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Nintendo Wii U GamePad Battery: Replacement Part #ARR-002
Comparing all three batteries for the Wii U Gamepad - YouTube
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Nintendo Wii U Gamepad 3600mAh 3.7V Rechargeable Extended Battery Pack - video gaming - by owner - electronics media...
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Wii U Gamepad Battery Pack (2550mAh) for Wii U
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