Just replaced the 97 WH battery on my Xps15 for the third time in 4 years, got the battery from third party on Amazon for $50, no issues, and the second battery lasted longer than the Dell OEM battery. Just search for 6GTPY. Not sure what DRM issue you ran into.

Install the Dell Power Manager application as it has very granular controls to allow you to maximize battery life and avoid the swelling issue. Good luck.