When I updated my iPhone 4 to the latest version my battery life doesn't last at all. What can I do?

I never had a battery concern till I updated to the latest version of software. What can I do?

Did you already try to reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again? You will not lose data by resetting.
If this does not help, set it up as new device:
How to back up your data and set up as a new device

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