[Q] android system and kernel drain 35% of my barrety all the time topic

guys I need your help.. after lollipop update , "kernel" with 20% and "android system" with 15% are always topping my app sucker list. while in my mother nexus 5 (android 5.0, not 5.0.1 ), these 2 are always stalking aroud 7% each one. I have done factory reset, every sinking is off,always scanning in wifi is off,gps set on battery saving mode,on 2g (not 3g lte),internet just on wifi
in kitkat I had a far superior battery life. I am s-on and unrooted. every thing is stock
please help me.I want my m8 battery life to be as impressive as it was on kitkat times