56V. Not sure how much combined grass area we have, but it is anything but level and ours makes pretty short shrift of it. It does have rear wheel drive, but it doesn't interfere until you push the "go" button. I can usually take care of all grassy areas on a single charge of its 7.5 Ah battery as I do not use the drive; my wife needs at least one recharge as she runs the drive full time...