So you have a LG G4, and do not like the battery life?
I am going through the same problem, and I seem to have a solution, or at least something that helps.
The G4 seems to keep all apps open in the background, running, even when you have closed them apparently.
The one way to sort this out, as far as I have seen, is to hit the Recent Apps button next to your home button (the SQUARE), and do a CLEAR ALL. Battery life improves, demand reduces, and all that.
Once again, this is a trial phone, so maybe the actual one would be better. Who knows.