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Battery Life
We tested the Dell XPS 16 with Battery Saver turned on and a 50 per cent screen brightness, using the PC Mark 8 Home battery test, which runs a series of productivity tasks until the power runs out. These test scripts don't stress the gaming performance particularly, so this time doesn't represent how long you could play games on battery, although there is some 3D activity included. It's supposed to represent a mixture of everyday home user tasks.
Although the Dell XPS 15 hasn't been quite top of the league in our performance tests compared to our other notebooks, it does have a strength elsewhere – the battery life. With over four hours of PC Mark 8 Home under its belt, this really is a true portable. The test runs something pretty much continually, so if you're only making more casual use of its CPU and graphics, it could well last an hour or two longer.
@James Morris, did Dell confirm support for eGPU enclosures through that Thunderbolt 3.0 port? Merely having the port isn’t enough, system BIOS level support is also needed for it work.