[Q] Battery drain on every rom

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http://forum.xda-developers.com – i flashed miui v4 on defy green lens but experienced battery drain on my phone.so i flashed stock froyo and after that miui gb or cm7 whatever i flash there is battery drain from around 62-63% to 47% and 19% to 4%. Can somebody help me with this?i tried eveything like battery callibration and battery stats wipe but nothing helped. (HowTos)