Galaxy S3 battery life suggestions?

I have an i9300 running nightlies of CM 10.1, and battery life for me has been about the same (maybe slightly worse) to that of normal touchwiz. Anybody know what improvements I could make to battery life? I do the normal stuff like reduce the timeout settings an brightness an gps off etc. I hear about kernels and stuff, but I don't really know anything about that. Any suggestions? An explanation on how to install a (good) kernel for battery life help would be much appreciated. Or anything other than the usual beginner android battery tips.