für Nintendo Wii U Gamepad - Extended 3600mah 3,7V Akku WUP-001 | FPC
The standard Wii U battery is smaller at 1500mAh. This will extended battery life by adding another 2100mAh to make your battery capacity 3600mAh. Your battery should last more than twice as long. Remove the 2 screws holding the battery door.