Which custom rom gives the best battery backup...!!!?!!!

First of all thanks to all developers who are providing us such an awesome custom roms for lenovo k50 series. I appreciate their hard work.
I have only one question for all developers as well as junior and senior members in this community who are regularly flashing custom roms on their devices>>
which custom rom gives the best battery backup for lenovo k3 note/k50-t5 ?
Please comment below and let us all know, up till now which is the best custom rom for lenovo k3 note....!!

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