Testing consisted of full battery discharge with a mixture of active use and modern standby. Testing conducted by Microsoft in April 2020 using preproduction software and preproduction configurations of Surface Book 3 15” Intel® Core™ i7, 256 GB, 16 GB RAM. Surface Book 3 15” on base: Up to 17.5 hours of battery life based on typical Surface device usage.

Battery life varies significantly with settings, usage and other factors.

All settings were default except screen brightness was set to 150 nits with Auto-Brightness disabled.

The active use portion consists of (1) a web browsing test accessing 8 popular websites over multiple open tabs, (2) a productivity test utilising Microsoft Word, PowerPoint, Excel and Outlook, and (3) a portion of time with the device in use with idle applications. Testing conducted by Microsoft in April 2020 using preproduction software and preproduction configurations of Surface Book 3 13.5” Intel® Core™ i5, 256 GB, 8 GB RAM. Surface Book 3 13.5” on base: Up to 15.5 hours of battery life based on typical Surface device usage. *Some accessories and software sold separately.