I dont have any experience with Iphone's but, my Ipod touch has the stufftiest battery life in the history of anything ever. When theres nothing open at all but the internet the battery is sucked dry in, maybe a half hour.
This is with the brightness set all the way down as well. Why couldn't it be like the 3ds and last for weeks on end lol.
Also i could go into a rant about other stuff i hate apple for, but I'm not going to.
EDIT: Happy Birthday btw, almost forgot.