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Battery life varies significantly with settings, usage and other factors. All settings were default except screen brightness was set to 150nits with Auto-Brightness disabled. Tested with Windows Version 1.1(20H1) and Edge version 85.0.564.51. The active use portion consists of (1) a web browsing test accessing 8 popular websites over multiple open tabs, (2) a productivity test utilizing Microsoft Word, PowerPoint, Excel and Outlook, and (3) a portion of time with the device in use with idle applications.

Testing consisted of full battery discharge with a mixture of active use and modern standby. Testing conducted by Microsoft in September 2020 (Surface Pro X with Microsoft SQ® 1 and Surface Pro X with Microsoft SQ® 2) using preproduction software and preproduction configurations of Surface Pro X. Surface Pro X: Up to 15 hours of battery life based on typical Surface device usage.

