So i got my iPhone 3G 16gb Black on friday! Can't keep my hands off of it. As you know the iPhone out of the box has a nearly full battery, so as a test i finished charging it to the maximum and took it off charging to see how long itd last. Here are my results. Usage Time: 8 Hours 34 minutes Standby Time: 1 day 3 hours Call Time: 14 minutes Data: 50 mb in, 2 mb out Usage Specifics: -watched about 2 hours of video -listented to one hours worth of music on iPhone speakers (almost full volume) -3G on 15% of the time -Wifi on for 85% -Location services on 70% of the time -Used GPS for a solid 20 minutes -Listened to music through headphones for 45 minutes -Used apps for about 5 minutes -Push off -Bluetooth off -3G enabled all the time (but was used little since wifi was connected, but 3G appeared every time you woke it up) -Mail checked every 15 minutes -Looked at mail for 20-30 minutes -Went web browsing on wifi and 3G for 20 minutes -Called for 5-10 minutes -Texted for 2 minutes -Brightness on 25% -Connected to computer for no longer than 5 minutes to sync music and videos (may disturb this test but probably little effect) I think this is pretty decent, and i hope to see as good results or even better as the battery gets more used. I believe i took it off power around noon yesterday and it just died at 8pm today so it lived long.