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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 Review

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This Nintendo Wii U GamePad replacement battery is what you need to bring your dead controller back to life! Play longer with this 3600 mAh battery.

Nintendo Wii U GamePad Replacement Battery