I've only tried the included kernel and leankernel with this rom. With some tweaking and and undervolting, I was getting pretty good battery life using leankernel. On wifi, it would have about 50% battery left with light to moderate use (by my standards) after roughly 24 hours. On 3g/4g, I was getting about 20-24 hours with the same amount of use. Definitely better than the stock rom.
I would suggest trying leankernel with interactiveX governor on battsaver mode.
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