smbu2000 on 15 September 2011
It's not at max brightness, it's at the default setting. If you put the brightness higher then battery life will be worse. The estimated time also doesn't use the speakers(only headphones) and it's also with Bluetooth/wifi/3G all off. Using those will also decrease battery life.
I'm pretty sure nintendo's claims for the 3ds are 3hrs with everything on 3d, wifi, max speaker volume, max brightness. And that it increases as you adjust those settings. With sony's claim for the vita who knows how low it could go...
starcraft: "I and every PS3 fanboy alive are waiting for Versus more than FFXIII.
Me since the games were revealed, the fanboys since E3." 
Skeeuk: "playstation 3 is the ultimate in gaming acceleration"
