September 7th, 2011 | 
Author: Why does my iPhone battery run down so fast?
I have just got a iPhone 8gig 3 g phone. we will charge it up as well as inside of similar to 4 hour a battery is similar to ragged down. we do not understand.
Best answer:
Answer by John
Because a iPhone has a little really battery complete hardware. If we spin a liughtness environment down, we can fist additional battery hold up upon a device.
Tags: 
going on line playing with the apps and stuff like that all run down the battery fast
take it to the apple store, they will replace it. Mine lasts around two days
It all has to do with the settings.
Do you have an Ipod?
I do.
If you keep the settings high, then the battery will wear down.
So keep the brightness down.
hope it helps!
Please answer mine: http://answers.yahoo.com/question/index;_ylt=ArRkyR8ZDuSed7L2qft4Vuzsy6IX;_ylv=3?qid=20091115004933AA81iTp