Now that the Surface Go has reached store shelves, there's a lingering question: how did Microsoft stuff a full-fledged PC (if a modest one) into such a small body? You have your answer. iFixit has torn down the 10-inch tablet, and it's evident that Microsoft bent over backward to make the design work. For one, it has a surprisingly small battery. The 26.1Wh pack (split across two cells) is not only much smaller than the 45Wh battery in the Surface Pro, it's smaller than the 32.9Wh unit inside the 2018 iPad. That might explain its real-world battery life, which dipped to six hours in our tests.