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I bought the extended Gamepad battery. I see Nintendo planned a spot for it all along. : r/wiiu
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Somehow managed to fit a 10,000mAh battery inside of my Wii U game pad! Battery life from around 2 hours to (so far) more than 13 hours at full brightness. See captions,
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Nintendo Wii U GamePad WUP-003 Replacement Battery: BatteryClerk.com Game
Extended Battery Pack For Wii U GamePad - Tomee - Stone Age Gamer
Extended Battery Pack for Wii U GamePad – Retro Raven Games
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Wii U GamePad battery life gets a boost from new Nyko accessories - Polygon
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