I use L-ion battery powered lawn mower. It is so much quieter, lighter and starts at touch of a button instead of hard pulling of starter string. Starts every time!!
But I store the bastery inside a fireproof safe.
I have a 38 hp diesel Kubota FR3680 that I cut acres with each week. It has 1600 hours on it now and fires right up and will smooth cut to 2 1/2” in 5” grass as fast as I can stand to ride it burning less than a gallon an hour.
Think I’ll hold on to it for a bit longer.