Surface 2 Battery Life

So, Engadget just posted their results of the battery test on the Surface 2.

Update: We re-ran our standard battery test (video looping off the local disk, brightness fixed at 50 percent, WiFi on) and got a stunning 14 hours and 22 minutes of battery life -- even better than our preliminary result with the ambient light sensor turned on.

This is somehow different than The Verges results?

I got six hours, 43 minutes on the Verge Battery Test

Comments on this guys?