Yes there is a new leaked htc kernel, which suppose to be good on the battery,i personally haven't tried since I like my fps uncapped.You can find a rom with it or just flash the kernel..
As for your original question, everyone is gonna give you a different answer.Im on netarchy bfs 1.91 battery is pretty good, when you non-stop use the phone it drains pretty fast..i haven't tried kings #9 because after awhile I found netarchy kernels more stable..so you should just try a few different kernels and see what's best for... Btw overclocking has a pretty good impact on battery life ime.
Sent from my Evo using Tapatalk.
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HTC Evo
ROM: Calkulin's EViO 2 Froyo v.1.5
Kernel: Netarchy's 4.2 CFS HAVS MORE SMARTASS UNIV.
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