How's everyones battery life? Mine is terrible.
Flash a custom kernel (links at the bottom of the OP) and grab Nstools from the market so you can adjust the kernel settings, also open Google Now and go into settings then turn off the sync features you do not use. For me personally, I have turned Google Now off completely. I just don't need it. These steps should help your battery life.
I'm sure that in time we will figure out how to improve battery life further. But I do agree that JB out of the box does not seem to be battery friendly.