What bin speed is your CPU? I have a faster binned CPU and running houstons carbon ROM with adreno kernel I have it undervolted 75 MV and get 16 hours uptime with 4 plus hours of screen time. The fast and faster binned CPUs can be undervolted the most. I also use the intellademand governor.
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Phone: LG Optimus G E-970
ROM: CM Official RC1
Radio: ATT JB /.33 hybrid