-skype, facebook, etc. eat up lots of energy.
-some service providers put a little process in there to monitor you. Drains battery.
-I stopped all unnecessary processes running in background. Check running apps as some free ones have "floatware"? I think thats what its called, and allow processes to run in background.
-Downloaded cool black wallpapers (not live)
-Use battery saver once at 40%, will give you 1.6x battery life while on. Operates sync, gps, wifi, and 4g for you. Turns them off when not being used.
-Got a data switch to switch between 4g and 3g, only use if I'm worried about phone dying before I get home, or to my car.
-turn brightness down unless bright outside.
-now that my battery is broken in it lasts all day/night till I get home, and the screen uses 40% or less of the power, down from 80%.
-still may upgrade eventually to larger battery.