IDK if it has been mentioned, but here are a few ways to help your battery last longer, rooted or not:
- Keep GPS OFF all the time! Only turn it on when you specifically have to use it for G-Maps or something
- USE WIFI WHENEVER POSSIBLE!!!
- Turn screen brightness down as low as you can stand; I personally keep mine at about 20-25% and it's plenty bright
- You need to "cycle" the battery a few times, hopefully the phone is still pretty new or it won't really do much.. Essentially, charge the phone to 100% then run it down to 0% to where it turns itself off due to battery dying; then LEAVE IT OFF and charge it without touching it or even thinking about it for ~4-5hrs, and once it is charged to 100% turn it on, and do this a few times... Doesn't have to be consecutive, but don't spread it out over a week either.
- Go to Settings - Apps - All Apps and "Disable" ANY apps you don't use, as a lot of them can run in the background without you knowing it
- Keep your homescreen as free of Widgets as possible, use icons instead (shortcuts)
- Use a DARK COLORED, STATIC WALLPAPER! NO LIVE WALLPAPERS!
- Turn off WiFi when you are on mobile data, or it will constantly search
- Keep "sync" turned off, and do it manually and only when you're on WiFi (helps save data too)
- Don't forget to "swipe away" apps you're done using, and also to "force close" them in settings - apps
- Restart your phone every 3-4 days to clear up the RAM
- Go through your list of installed apps, and if you see something you don't use that you installed (if you haven't used it in ~2-4 weeks), uninstall it
- CLEAR CACHE FOR APPS!
- "Disable" the "DRM Protected Content"(?) app under Settings - Apps - All
Oh, and make sure your camera isn't running by opening it when you first start your phone, then hit back, open the recent apps and swipe it away, then settings-apps-all and find "camera" and click "force close".
Hopefully these help a bit!