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In my real-world usage, without opening a single graphics app - justĪpps in Chrome, Firefox and Slack with brightness set higher - I'm down to 23% after roughly 3.5 hours of steady use. You can charge them independently as well. The system automatically uses both batteries - a small one in the tablet section and a bigger one in the base - which drain and charge together when they're connected, and which you don't need to think about unless they stop charging or communicating. (I'm still waiting to hear back from Microsoft on that problem.) In our streaming video tests, which don't tax any part of the system heavily, the battery lasted up to a reasonable 12 hours with brightness initially set to 50. On battery, my test unit wouldn't let me disable autobrightness, which even in a dim environment dropped it unusably low - to about 50 nits. Though Microsoft rates its battery life at 17-plus hours, that's on the optimistic side Microsoft's tests include standby time, which resembles some people's actual work behavior.
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