Save battery life on LG Spectrum 2?

My battery is absolutely terrible on my LG Spectrum 2, i'm guessing because it is because of the Huge Screen it has. I even rooted my Phone to try to save battery. At one time I thought it was the battery at first, but I got the same OEM battery from LG that belongs to my phone for 3 times now. What's your thoughts to save battery on a phone? I even check to see if any non-important applications are running.