Best answer: Opting for a 4K display on any notebook will draw more power and thus reduce battery life, but you should still enjoy around six hours of use taking into account the 97Whr battery upgrade on select Dell XPS 15 9570 configurations.
Dell: XPS 15 9570 ($2,000)
Better display draws more power
Dell considered the increased power draw of the Dell XPS 15 with a 4K display, which will consume considerably more than the 1080p option, especially with the increased resolution and touchscreen support. The base models come with a 56Whr battery pack, while more pricey configurations come rocking a 97Whr power plant and are better suited for the 4K upgrade.
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