I was talking raw WHr rating, not power usage. Linux's mediocre power management is one of the reasons I put extra emphasis on the battery when shopping for a laptop. My t450s w/ the 6 cell external has 72WHr vs the XPS13 of that time had 54WHr. Plus my Lenovo battery is hot-swappable.

They have improved upon this some as the current XPS13 has 60WHr. But they still are lacking in this area.