[Q] Galaxy S2 Screen Battery drain

view story

http://forum.xda-developers.com – Hey,guys.My dad recently give away his Galaxy S2,and I updated it to 4.1.2 android JB.I noticed that the battery drains faster than on ginger bread,I looked at the battery stats and it shows that the screen uses 44% of battery.Next day I checked it showed 56%.Is it normal? BTW I went to bed when my phone battery was 89%.When I woke up it was 79%.I did the battery calibration by charging to 100% taking off the battery and putting it back on after 5min.But I don't see the difference after that.Please help! (HowTos)