EV batteries all weight in the 400-500kg range, and the volume is similar for all cars (size of the underfloor). Given that these are pretty much fixed variable

EV batteries all weight in the 400-500kg range, and the volume is similar for all cars (size of the underfloor). Given that these are pretty much fixed variables, the range figure is a good measure to report on. For density it means getting close to 500Wh/kg, but that is not something most consumers can understand. Efficiency is a function of the car design and drivetrain, how would that apply to the battery itself?