Maybe it's just a UK thing but I can't think of the last time I even saw a non-electric lawn mower. Even going as far back as the 80s they were the standard, just don't mow over the cable!
Depends on where you live and the size of the yard. Electric are great when the size isn't that big. Once you go larger, it becomes very hard to do practically with electricity.
There are different types of mowers - push (usually 4cycle), push+self propelled, riding one(s), then 2cycle scythe types, and then trimmers and brushcutters (spinning blades). Those options (more or less) are available battery powered, too. Battery powered ones have shorter use per charger but they are lighter (and usually less powerful).
However, if you can use a robot one (or few of them), it tends to be an easier setup - it does require flatter lawn and what not, though. However they are insufficient in cases where one really needs a riding mower.
Personally, I have/use a robot, a battery powered strimmer, gas powered brushcutter, and a push behind mower. The main job is done by the little robot, but the rest have their uses as well.
> Maybe it's just a UK thing but I can't think of the last time I even saw a non-electric lawn mower
UK here. I've been using a petrol mower for the last 25 years. My lawn is 40m long. I do own a 50m extension cable but it would be a real hassle for grass cutting. My three adjacent neighbours also have petrol mowers.
