The big 15-inch high-resolution display accounts for a big chunk of the Surface Book 3's power draw. If a device finishes the test sooner, it will idle until the ten minutes is up, so faster devices will be able to get into the “hurry up and wait” stage which should be a benefit in this test. The Modern Office battery test runs three scenarios, each at ten minutes in length. The large battery once again does what it intended, offering almost 10.5 hours here as well. PCMark 10 Modern OfficeĪdding in a new test means we unfortunately don’t have the backlog of data from previous devices, so for now please accept this smaller comparison. The Surface Book 3 achieves almost 15 hours of battery life in this test, outperforming the previous model by five minutes. Movie playback tends to be one of the best ways to achieve battery life, since the video decode is offloaded to fixed-function hardware in the media block which can be very efficient. There are devices that can achieve longer battery life, but since so much of the power draw is the display, they tend to have much lower power 1920x1080 offerings. It achieved 46 minutes more runtime than the Surface Book 2, and since they both share the same display, likely points to the efficiency gains of the new Ice Lake processor under load. Despite the large, high-resolution display, the Surface Book 3 offers particularly good battery life at 10.5 hours on this test. The extra battery capacity certainly helps the Surface Book 3 maintain all-day battery life. We’ve dropped our old light test, since the workload was almost an idle time for modern devices, and will now be testing our heavy web workload, movie playback, and new to this review, the PCMark 10 Modern Office Battery life test. To test the battery life of the Surface Book 3, the display was set to 200 nits, and the total time was measured to discharge a 100% charged device in a couple of scenarios. But battery capacity is only part of the equation, with platform efficiency also being as important. One of the advantages of the Surface Book design is that it offers up a significant amount of space for battery cells, with around 22 Wh in the tablet, and another 63 Wh in the base, adding up to 85 Wh total capacity.
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