How to Fix Fast Battery Drain Problems After iOS 5.1.1 Upgrade

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Some users have reported that the recent iOS 5.1.1 update is significantly affecting their iPhones’ battery life. Here’s a quick fix that you can try.


This issue seems to be affecting more to users who updated their iPhones using the OTA (on-the-air over-the-air) update. This update can be done without connecting to iTunes and it will download all the necessary updates, patches and fixes without downloading the whole IPSW.

Before you begin, it’s highly recommended that you backup your iPhone.

WARNING: If you rely on any jailbreak or unlock, it’s best to avoid this fix. You may need your official activation SIM card once the steps below are performed.

Editor's note: learn more by reading our ebook on starting your own iPhone repair & unlock business

1. Go to Settings > General > Reset > Reset All Settings.

2. Enter your Passcode (if you have it set), then tap Reset to confirm.

3. Your iPhone will Reboot. Once your iPhone is activated, set it up as new and then personalize it as per your requirements.

4. Finally, charge the battery until it reaches 100 %.

Hopefully that would fix your battery woes. Let us know if this helps!

How to Fix Fast Battery Drain Problems After iOS 5.1.1 Upgrade was last modified: June 15th, 2012 by Jonathan

Comments & Discussion

  1. I’m using i4 with iOS custom 5.1.1 on 2.10.04 with Gevey Sim, Jailbroken untethered with redsn0w. I was having serious battery issue after restoring to custom 5.1.1. I did some searching for solution and at first doing this helped, Settings>General>Date & Time>Turn ‘Set Automatically’ to OFF. Immediately I had a better battery life.

    Further, I managed to get an original carrier sim and cut it to micro size for my i4. Used redsn0w to deactivate the phone followed by activating with the micro sim via iTunes and charging for an hour past 100%. That’s all, and now I have even better battery life !!

    A full day mileage with moderate+ use. and 36-48 hrs mileage with normal/regular use. I have 24 hr data, 3G, location service and exchange email with iCloud push always ‘ON’, I have managed my notifications but basics are enabled though like weather, sbsettings, phone, messages, reminder, calender and mail ….. :D ….

    I’m happy now. Hope this helps. Ciao.

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