My battery life decreased dramatically after updating to ios 6.1.2.  How do I delete and go back to previous iso?

I have iphone 5; my battery life decreased dramatically after updating to ios 6.1.2.  How do I delete and go back to previous iso?

Downgrading the iOS isn't supported and wouldn't help even if you could.   There have been reports of decreased battery life after every update since iOS 1.0.1. 
There are lots of things that can be done including reinstalling push email accounts. basic phone reset (pressing both home and power buttons for at least 10 seconds until the Apple logo appears), and restoring the phone with and without a backup.

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