I recently updated to the latest ios 5.1.1 on my iPhone 4s (yea i know its been out a while but i don't jump on the new bandwagon) and after I did the update I noticed that my battery life took a dump on me and the phone only lasted a few hours vs 10+ hours.
I discovered this to be a fairly common issue with users who updated iOS through on-device Over the air updates, although it doesn’t seem to be much explanation as to the cause. But anywho here is the quick fix.
1. Perform a manual backup to iCloud or iTunes before you do this just in case (Note: this will clear your settings, apple id's, passcodes, etc so you will have to re input them)
- Open “Settings” and tap on “General” then “Reset”, tap on “Reset All Settings”
- Enter the passcode if you have one set, then tap “Reset” to confirm the settings adjustment
- Reboot the device and set it up as new, reentering personalization data as necessary
Battery life should be immediately improved
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