Unlike some manufacturers, HP doesn't give a specific time for how long it expects the HP Pro Slate 8 to last under normal use. Do, we ran two tests to check this ourselves: AnTuTu's official Battery Test and our own customized battery test that involves setting the tablet's brightness to half and loading a webpage that refreshes itself every few minutes.
The HP Pro Slate 8 performed pretty well on AnTuTu's battery test. Though it didn't have the longest uptime, it was only about 14 percent away from the test leader, Lenovo's Yoga Tab 3 8 (which costs less than half the price of HP's tablet). On our custom battery test, the HP Pro Slate 8 was a little worse than average; though its 8 hours and 21 minutes of battery life gives you a full day of uptime for casual activities, that's still pretty far behind the 12+ hours you can get from competing tablets.