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I updated my non-rooted Samsung Galaxy S2 from 2.3.5 to 4.0.3.

Now, I recognize a significant decrease in battery lifetime.

Any idea what may cause it and how to get around it?

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    This question is extremely hard to answer without any details. At least look at the "Battery" stats in your settings screen and supply some stats on what's using the battery.
    – pzkpfw
    Aug 28, 2012 at 7:30
  • I agree - my intention was to ask if this may be a common problem with that Android version or device. Aug 28, 2012 at 9:18
  • Concerning current battery consumption - I see 50% for the screen (allthough it's off for most of the time) and 25% for Android OS and no application with significant consumption. Aug 28, 2012 at 9:20
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    It's normal for the screen to use most of the battery, if the Android OS takes a lot even in standby you should probably try a factory reset/clean install.
    – pzkpfw
    Aug 29, 2012 at 12:08
  • This could be caused by WakeLocks (see: How to deal with (orphaned) WakeLocks?). Please check at least your battery usage screen for the indicators described in that questions answer; if they match, follow the steps there (and let us know here).
    – Izzy
    Dec 22, 2012 at 14:11

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