I've been using quanta kernel v20 with force doze App amplify app default settings and l speed app with battery profile on and and kernel auditor app with power saving governor on cpu and 600mhz minimum and and settings database editor to turn off wifi and Bluetooth scanning and etc other stuff off
got 5 day battery life projected this is with wifi and data off and location off battery saving mode on but cellular connection off just to say what is possible I am on cm13 8-20 snapshot build
A day battery life is probably my average right now with light use realistic use because I actually turn the screen on the projection was for screen off battery life
There is no magic kernel that is by far the best and superior to everything else. There are different kernel which do all the same, like roms. The differnces are the presettings, which you can change to your likings in every kernel. Just choose one and play around with some settings.
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