Nintendo's US boss Reggie Fils-Aime has refused to be drawn on how long the Wii U GamePad's battery will last for.
In Nintendo's latest Wii U specs, it was revealed that the Wii U GamePad would be powered by a rechargeable lithium-ion battery. There has been talk of the battery life lasting between 3-5 hours but no mention of this was made in the spec sheet we were supplied.
Now Reggie is reticent to reveal the exact figure. Speaking with Kotaku, he said: "I have to say that, as a company, we are amazingly conservative when it comes to giving guidance on things like battery life. If you go back to the 3DS discussion on battery life, the numbers we gave before launch vs. the reality of launch were very different. So what I would tell you is that Nintendo is absolutely committed to making sure that the battery life for the Wii U will not get in the way of the gaming experience."
Of course, you can charge your Wii U GamePad while you're playing by attaching a power-unit to the bottom of the controller so it shouldn't be an issue as, unlike 3DS, you can't play Wii U games out of the house.