Battery drain after installing IOS7 on Iphone 4

Hi
I have recently installed IOS7 on my IPhone 4.
The battery drains really quickly even when I am not doing anything with the phone. I never had these problem before updating.
Suggestions please???
Thanks

I have also noticed what appears to be decreased battery life after the upgrade, though not this bad.  Seems many people are noticing problems. 
I noticed and changed a couple of settings that seem to have helped.
- first, fully shut off the phone and then turn it back on - i read online this helped some, immediately after the update.
- in mail settings, for the icloud account (I dont use this but it was configured by default) check the sync settings . it defaults to push, which takes more power.  you might want to disable push and set to fetch for this and any other accounts you have, for additional power savings
- in settings, location services, scroll to the bottom and tap system services : All of them are defaulted to on.  I turned off location-based iads and setting time zone since i dont need those. (I also opted out of the diagnostics and usage as part of the setup, but it was set to on in this screen - i left it on for the time)
- also in settings -- location settings:  check the list of apps and verify that only the ones you want, are enabled
These few settings seem to have improved things

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