I have a Samsung Galaxy S II GT-I9105. My problem is battery draining. It works normally after I charge it to full, but as soon as the battery percentage hits 30%, draining accelerates and will go to zero within seconds (literally).

But if I charge it and unplug at 12%, it drains normally again...

What is the problem? Should I buy a new battery?

Update: I have bought a new battery and recalibrated but the same battery draining occurs

  • Replace your battery !
    – user77195
    Dec 23, 2014 at 3:41
  • @Droidzer, Sure its battery problem? I just wannna confirm before I replace. Dec 23, 2014 at 4:50
  • I am sorry i just read your last lines. Can you tell me if do you use the same charger ?
    – user77195
    Dec 23, 2014 at 6:28
  • Battery may need to be recalibrated.
    – HasH_BrowN
    Dec 23, 2014 at 6:55
  • @Droidzer... yes, I have been using the orginal cherger... Dec 23, 2014 at 15:11

1 Answer 1


Try resetting your Android to factory setting and see if that helps. Otherwise I would suggest trying out a new ROM, as that helped improve my battery life considerably.

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