Battery Life

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http://forum.xda-developers.com – Greetings all , I noticed that my battery on Xperia tablet s draining very fast . For example : i am on battery for 4h 24 minutes and i have 76 % left with 1hour 26 minutes screen time .( Which i made some internet Surf and watch some video) Android OS has 26% of usage with Keep wake 2h 16 minutes. Is that ok ? or something going wrong with my battery? I think thats very bad stats. Cheers Vatis (HowTos)