how to epic 4 G battery going for days

I have read and learned about this phone (stock, nonrooted, with stock 1500 Batt). I am running Juice defender (purchased pro level, and app killer). After reading a lot on this and other sites I found out that the running services DRM is the one to shut down under the application tab then into running services. I have used the phone for 13 hrs yesterday and now for all of today (so far 9hrs) and have 3/4 battery full. I have been on web (wifi stays on) and taken several calls yesterday and today. JD is taking some credit but the DRM shut down really helped with 2.1 OS