286 km for the KF1 EV, over 350 km for the D01. Those are rated figures, and rated figures are honest about what they measured: a set procedure, not your Tuesday. Load, terrain and traffic all move them, and a fully laden flatbed on a climb moves them most.
Gradient is the one people underestimate. Climbing costs energy in a way that flat distance does not, and the road out of the valley in any direction is a climb. The compensation is that the descent gives some of it back through regeneration, which is a thing a diesel simply cannot do — coming down, the vehicle is charging.
How the pack itself holds up over years of that, and what the warranty says about it, are questions with specific written answers that MV Dugar Group hold and we are not going to paraphrase. Ask for the battery terms as a separate document from the vehicle terms, and read them that way.