Cost of Driving an EV

Right. If the grass is relatively short & dry, and You walk at a good pace, You can cover about 1/2 acre. But the faster You walk, the less the quality of cut, because the motor speed tends to stay on low in those conditions(light load). I considered buying 2 back-up batts, would cost almost as much as buying a 2nd mower....which I might....
if the mowers are anything like any other battery powered tool, it would be cheaper to buy a whole new set up and get your extra battery and charger that way, then it would to buy a separate extra battery