A Surface Book 2 and Surface Headphones
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Overview Tech specs Reviews

[1] Surface Book 2 battery life: 
Surface Book 2 13.5”: Up to 17 hours of video playback. Testing conducted by Microsoft in October 2017 using preproduction Intel® Core™ i5, 256GB, 8 GB RAM device. Testing consisted of full battery discharge during video playback. All settings were default except: Wi-Fi was associated with a network and Auto-Brightness disabled. Battery life varies significantly with settings, usage and other factors. 
Surface Book 2 15”: Up to 17 hours of video playback. Testing conducted by Microsoft in October 2017 using preproduction Intel® Core™ i7, 512GB, 16 GB RAM dGPU device. Testing consisted of full battery discharge during video playback. All settings were default except: Wi-Fi was associated with a network and Auto-Brightness disabled. Battery life varies significantly with settings, usage and other factors.
[2] System software uses significant storage space. Available storage is subject to change based on system software updates and apps usage. 1 GB= 1 billion bytes. See Surface.com/Storage for more details. 
"Most powerful Surface laptop" claim refers to processing power.