Jaazwaaz- I have an iphone 5 on Verizon that shipped with ios 6 and I get roughly a day or more of standby and 6-8 hours usage, usually closer to 8 if I'm on wifi most of the time. Very happy with that, so i have been reluctant to upgrade to ios 7 bc of battery drain horror stories, especially for the iphone 5 and for Verizon in particular. There is a graphic out there that shows battery life test results after ios 7 upgrade and the 5 took the worst hit of all the apple devices ! Plus you can't go backward now so ur stuck with 7 if u take the plunge.
Anyway my questions are:
1. Did your phone ship with iOS 7 or did you upgrade to it from 6?. And if you upgraded did you do a New setup, restore from backup, or sync contacts etc only?
2. If u upgraded, is your battery life about the same as u were getting with ios 6?
3. Who's your carrier?
Thanks! I have a feeling that an iPhone 5 that had good battery life with ios 6 will also have good battery life with iOS 7, but I have no evidence to back that up. In other words, there is a ridiculously high percentage of faulty iphone 5 out there, although I have been one of the lucky ones so far.