Last year's version of this Microsoft hybrid, which has an extra battery in its keyboard base, ran for 709 minutes, or 11:49. The new Surface Book 2 ran for even longer in initial testing, but some battery runs were inconsistent and we're conducting additional tests to confirm those scores.
A gaming laptop is a surprise here, but note that despite the graphics chip inside, this is actually a standard mainstream Inspiron with a big battery, running for 578 minutes. This is the version we tested earlier in 2017. The late-2017 update has a smaller battery and did not make our Top 25 list.