they said they would target the same batterylife as the DSi.. which is less then the DS.. but still 9-14 hours...
http://uk.wii.ign.com/articles/109/1098500p1.html
7:10: What's the battery life like with the 3D use on 3DS? Battery life is important to us and we want to match the DSi. Please, I want to focus on software, so let's talk about that.
Face the future.. Gamecenter ID: nikkom_nl (oh no he didn't!!)