I too had the major battery drain after installing ios 7 beta 1. It was the worst drain I've ever noticed with all iPhones and all ios versions. I was in a rush and set up ios 7 using a backup. That was the big mistake. Especially with major software updates, it's best to update and start from a fresh copy of the OS and set up phone as new a device. Today I restored to factory and installed ios 7 fresh. Then instead of using any backups, I "set up phone as new". Then go into iTunes and manually add your contacts, music, apps, etc. it may take a little longer but it's well worth the time. After you are finished setting up your phone the way you want it, then go ahead and take a backup of everything.(iCloud and iTunes) I went the entire day with the same battery life I had on ios 6. Let's hear your results!