[HELP] Battery Life topic

Can someone please explain to me why I only get 7 hours of battery life? Using ViperOne with ElementalX

I've seen some people on here get 20+ hours.

Here are my battery stats thus far.

https://www.dropbox.com/s/kwr8007z37...8-21-56-53.png

https://www.dropbox.com/s/2hbmcb23s6...8-21-56-59.png