Snakebyte Wii U power:pack (black) - 2500mAh Lithium-ion battery for Wii U Controller / Gamepad Replaces original battery while providing 66% more capacity (2500 mAh) Up to six hours of gameplay per battery charge - Nearly double the performance of the original battery Fits perfectly in the GamePad with no impact on ergonomis or weight Battery compartment cover and screwdriver included