Many iPhone users complain about the iOS updates as some unexpected surprises face them such as battery life which is the most important source on iPhone the latest firmware updates iOS 5.1.1 is not away from this issue but after many researches we found a simple solution i think that it can help our users especially the iPad 3 users.
Note: This issue is a common issue with users who updated iOS through on-device OTA updates [ OTA updates is the update directly from the i-device allows you to download only the files that are different, so the file size will be smaller than general IPSW downloads, making the installation process faster]
Note: It’s better to perform a quick manual back up through iCloud or iTunes
How To Fix iOS 5.1.1 Battery Life issue ?
Step 1: Open “Settings” and tap on “General” then “Reset”, tap on “Reset All Settings”
Step 2: Enter the Passcode if you have one set, then tap “Reset” to confirm the settings adjustment
Step 3: Reboot the device and set it up as new, reentering personalization data as necessary
Step 4: Then charge the battery until 100 %
I think that your battery life should be improved, this tips is for iPhone, iPad, iPod touch and also the new iPad please let us know if this tips solved your issue or not.