Nyko announces that they will begin to sell WiiU Gamepad extended batteries This is a big thing for the WiiU because of the Gamepads 3-5 hour battery life.
Nyko says that the new battery will triple the amount of playtime, and will not be any bigger than the original battery pack. It will be compatible with all Nyko charging stations as well as Nintendo's charging cradle.
This is a great thing because one of the WiiU's major drawbacks is the battery life. I hope this will be as good as the 3DS battery. I have my 3DS with the Nyko battery and I don't have to charge it for days.