Default [Q] optimus g kernel

Hello.
Recently I flashed asopa 4.4.4 unnoficial for our phone. Is a great ROM but I don't get a lot of battery life, I read that in normal use you could have 13 hrs of battery life, but I get 10 at most. Happened the same with vanir and other custom ROMs , how do I get the best battery life in a custom ROM? With the kernel configurations I guess, but there is any kernel that could be as good as being on stock 4.1.2? What kernels are for custom gee ROMs? Which one you recommend?

Or what is the custom ROM + kernel combination that gave you the best battery life?