Dell XPS 13 (2015) 9343 - Battery Life

I have the QHD+ version and was just trying to see how much battery life others were getting and whether i got a faulty model. My fan is relatively non-existent since i fixed that problem and in power saver mode I'm only getting about 6 hours of light browsing (firefox) battery time. I checked the Task Manager and nothing is using the CPU in a ridiculous way.

Whats every one else getting battery time wise?

Edit 1: I got the microsoft signature edition and removed all programs with the name...

Dell XPS 13 (2015) 9343 - Battery Life