Oh, another thing I have found that contributes a longer battery life. When your phone is charging and you notice it is at 100%, leave it on the charger an additional two hours. For some reason that's always helps increase battery life for me.
That's because when the standard Apple meter gets to 100% it isn't actually at the full 100%. The only way you know when the battery is truly charged is once the current is actually cut off. The phone will still usually keep charging for another half hour after it hits 100%. I use batterylife (jailbreak app) to see when my phone is actually full. I watch the voltage get to 4355mv and it stays there for a good 10-15 minutes then it cuts the charge and the voltage will drop a little and then you know it's full. When it hits 100 on the statusbar its never actually really full for another half hour on average. That's why you will see a little more usage when you leave it on the charger longer. Back in the iOS 6 and before days there was a little plug that would appear in the battery when the current was cut off. I wish they wouldn't have taken that out!