REAL SOLUTION!!!!
Dear All,
After going for a couple of weeks with CCCCCRRRAAAPPP Battery life on my IPhone 4 (like 3% an hour with all Apps shut down), after updating to IOS 6 (but I found posts of people having this same issue on IOS 5), and reading through Threads, Forums and Articles on this issue...
Nothing convinced me in a FINAL way!!!
What WORKED is something hidden but simple: go to Settings-->General-->About-->Diagnostic & usage-->Diagnostic & Usage Data. Here look for the latest report on "Low Battery", and if you go into this report, in the Springboard section, you'll find the name of the rogue APP that's sucking your battery life! Once you find this App, delete it and VOILA!
I don't claim to be the only one knowing this, but after going through forums and more forums, came across many "hard reset" and "restore" and "delete email accounts" advice.... Never found this kinda simple advice that would prevent me from loosing all apps, contacts and texts!
Hope this helps all people with this trouble of USAGE=Standby Time!