My neighbors, younger couple, very nice also, purchased the house next door about a year ago. Needing lawn equipment, he purchased an arsenal of battery powered mower, trimmer, blower etc. it certainly is quiet, and the walk behind mower has a headlight so he can mow at night. Downside though, our St Augustine grass needs to be cut at about 4” height. That battery powered mower can not be set that high AND, if he lets the grass get a bit long, he really has to work harder to get it cut.
Suppose if I had short grass like northern lawns, the battery mower might be fine. As it is, I keep saving discarded mowers, they run great, sharpen the blade and cut away. And love burning 100ll Avgas premix in the edger, string trimmer and blower. Same as I use in the two stroke trials and MX bikes.