Hey guys, thought I'd like to share. I've been using the iPhone for about 3 days now since I've activated it (had it lying around after I bought it from Verizonwireless.com) and I'm still on the iOS 5.0 firmware. I've heard about the battery issue that plague the 4S or iOS 5 (whichever the real culprit is) and I haven't been experiencing horrendous batttery life that is being mentioned in this thread. I played with the phone the first two days after I got it not really paying attention how much battery was being drained but I did look up at the battery meter once in a while to check how I was doing, it was doing alright. I wanted to see how much my power my phone consumed during the time I was asleep/not using it so, I charged my phone up to 100% at 12 AM this morning, took it off the charger and didn't touch it until 10 AM. After 10 hours the iPhone was down to 95%.
Here are my settings:
3G: on, Wi-fi: off
Location Services: on, Maps: on, Siri: on, Find My iPhone: on, everything else: off
Sounds: Adjusted to quarter of the way up
Brightness: Left it however it came, halfway with auto-brightness: on
Bluetooth: off
Siri: on
iCloud: everything on except Mail, Photostream, and Notes
No Twitter account
Store: Everything off
I have the dedicated Gmail app and another email account linked to my school email that fetches new data hourly. I'm also generally logged into Facebook and my Dropbox account.
I think that's all the settings I can think off that would be relevant to battery life. As of this post my usage looks like 34 minutes active, and 11 hours: 43 minutes Standby with 91% power left.