Extended Battery Pack for Nintendo Wii U Gamepad 2600mAh 3.7V Rechargeable This extended battery is a third-party replacement for the one included in your Nintendo Wii U Gamepad. It has a larger capacity for longer game play between charges. It will fit inside the Wii U Gamepad without any modifications. Sometimes the battery will have to be charged and depleted a few times before the full capacity can be realized. Package Includes: 1 Battery + 1 Free Screwdriver