After my gas mower lost the transmission to the self-propelled wheels. I bought a 60v battery operated self-propelled. It takes two batteries to do the whole yard, but I've only used it once (The first time). Since then my wife has used it every week and just loves it. Nice and quiet and she gets exercise walking behind it. We have 3/4 acre so it takes about an hour to mow. I don't mind mowing, but she doesn't give me a chance. She's a keeper. (The wife and the mower).