Meh . . . like most battery powered stuff, it's only impressive till the battery dies, which is far too soon . . . (other than maybe in a small apartment of some other negligible use case . . .)
So, you've used one, right? I did a 120' driveway with 8" of snow with the 40V single stage and used about 1.5 batteries doing it. The first battery was recharged in a couple of hours, in case I needed more.