To test the battery life of a laptop, we use PCMark 8's in-built battery benchmark – which loops its ‘Home' benchmark until the battery fails. We do this with the screen brightness set at 50%.
A time of well over 4 hours is a great result for any laptop, so the Latitude 7370 is doing well in that respect. Typically you can double the result of the battery benchmark for a real-world estimate of battery life. This is because the benchmark is a continual assault on the laptop's battery, when in the real-world you are highly unlikely to be using the laptop so intensively for so long.
Why would someone get this over an XPS 13?