So i have been experimenting with roms/kernels in the past few days and have noticed android system is almost using as much battery as the screen. What causes this? I never had this problem before I rooted. I am currently at 69% and my screen on time is only 1 hour. I have tried many kernels and I can't get any more battery life out of the phone. Other than the obvious stuff, what can i do to get better battery life?