Used Kobalt lawnmower with one 40v battery and the original charger. Only used it for about a year before we moved houses, now it sits unused in our garage.
19 inch deck is great for smaller lawns. No cord to accidentally cut, no need to fill a gas tank or change engine oil. Easy to access battery so if you have a second one, you can swap out and double your run time. I don’t remember how many minutes it ran but I used to do my front lawn with plenty of charge to spare. Probably needs the blade sharpened, to be honest. $60 OBO.