Couldn't find any list of compatible laptops. Not enough Watts for XPS 15. The laptop needs 130W external charger. It may slow down battery drain of laptop when not plugged in, but not convinced it helps that much.
No, I would not recommend this to a friend
Works out great with Dell computers and accessories that require a USB. Good length of battery and small enough to be portable easily. Definitely recommend for Dell laptops especially with the price match for the best possible price.
I would recommend this to a friend