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Testing consisted of full battery discharge with a mixture of active use and modern standby.

Testing conducted by Microsoft in February 2021 using preproduction Windows 10 software and preproduction 15” AMD Ryzen™ 7 Microsoft Surface® Edition processor, 8GB RAM device. Up to 17.5 hours of battery life based on typical Surface device usage Surface Laptop 4 15” AMD Ryzen™ 7 Microsoft Surface® Edition processor 8 GB RAM.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. 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 February 2021 using preproduction Windows 10 software and preproduction 13.5” AMD Ryzen™ 5 Microsoft Surface® Edition processor, 8GB RAM device. Up to 19 hours of battery life based on typical Surface device usage Surface Laptop 4 13.5” AMD Ryzen™ 5 Microsoft Surface® Edition processor 8 GB RAM.

See aka.ms/SurfaceBatteryPerformance for details. Battery life varies significantly based on usage, network and feature configuration, signal strength, settings and other factors.Microsoft 365 and some software and accessories sold separately.