Dell said a vexing charging issue impacts a “limited number” of XPS 17 9700 laptops.

Updated with forum reports that the fix requires a hardware swap.

Dell confirmed that charging issues with some of the company’s new XPS 17 9700 laptops, as well as some of its Precision 5750 corporate laptops, have been identified and fixed.

The problem came to light when Dell XPS 17 9700 review units tested by Notebookcheck.com (which first reported it) and PCWorld exhibited the strange behavior of discharging their battery while plugged in, if the laptop was under heavy load. To help diagnose the issue, PCWorld sent its review unit and charger back to Dell for analysis.
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https://www.pcworld.com/article/3569131/dell-fixes-charging-issues-with-some-xps-17-9700-laptops.html