What screen brightness do you keep your iPhone at? I currently have mine around 75% however sometimes the battery doesn't last the day. I'm thinking about lowering the screen brightness down so it will last the day.
40% with auto-brightnesses. It's always been perfectly usable this way. I'll sometimes take it all the way down at night in a dark room or all the way up if I'm gonna be out side all day, but those times are rare.
I keep my brightness on 40-50%. I get about 6 hours of usage a day before I go to bed, and I plug it in around 50-55% battery left. Mostly texting and some mild web browsing.
30-50% during the day (indoors); 70-100% outside in daylight or when doing things like editing photos. Screen brightness definitely is the biggest battery drain I've found by far for me, so I tend to keep it as low as I can get away with for the ambient light conditions.
I'm at apprx. 60% with auto ON. WiFi on all the time...email push every hour. I get through an entire day with approx 40% battery remaining. I use the phone a moderate amount throughout the day. Cosmo