I have the Kobalt 80V. Batteries are 5AH and 2.5AH. (I also have the lawnmower, leaf blower, string trimmer and hedge trimmer.)

My driveway is about 60' long, but only need it for about 40' of it. I should be able to easily clear it with the 2.5AH with juice to spare. The batteries recharge fast enough that by the time I drain one, the other would be ready to go again.