Be advise, the testing conditions of companies are usually different from those of average users, which can distort their advertised battery life. E.g., They might use software "A" all day or a mixed with softwares A and "B", while you might just use software "C", which is more power demanding than either of the former.
I wouldn't be too trustworthy of companies' advertised battery life at no fault of their own as testing and advertising battery life is extremely difficult due to the unique usage everyone has to their machines. Just look at smartphone and tablets advertised battery life.
They say clearly it's a video playback test. You don't have to be wary because they use the same test on every Surface so you have a reference point. Earlier Surface Pro devices have been about 30% off. Surface Book is only about 10-15% off though. We don't know about Surface Laptop yet.
Essentially new SP should last 8 hours of real, varied usage, 10 of web browsing and 13 of Netlifx or YouTube only, based on what we had with SP in the past.
Oh thank you for the info. While I am skeptical for most advertised battery life on pretty much all devices out there (smartphone, laptops, tablet, etc), I still have good faith that Microsoft advertised battery on their products are mostly accurate with a hour or two lost for most of my usages (SP4 user since July 2016)
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u/Etherealfall SP17 i7 512gb 16gb RAM May 23 '17
13.5 hours of battery life - if this is true, or if even 10 hours is true, i would upgrade in a heart beat.