What strange comments. I don't believe I have ever cleaned a spark plug in a lawn mower, let alone "clean it continuously", and can never remember having to replace one either. The air filter does need to be cleaned and the oil changed periodically. I have never had a problem with stale gas.

I don't have a cordless mower (mow 4 acres each week) but have a Ego cordless trimmer. Wanted a second battery and Home Depot has a 2.5 Ah batter for around $120. They also had a cordless blower and quick charger and 2.0Ah battery on clearance for $90 so I bought that instead. It was an older discontinued model. The battery only lasted for six months when I discovered it sat uncharged in home depot for about a year and a half. Called up Ego and they have a three year battery warranty. They just wanted the serial number and send a 2.5 Ah battery with no questions asked! So you are covered for three years at least with Ego.

Just don’t let your grass get too high!

Ryobi
 

I have a battery operated ryobi which has been very successful on the lawn here in Caroline. It folds up, taking less real estate in the garage, whole lawn on one charge. Would highly recommend..

That's the surprising part. I thought I'd be mowing twice a week when I bought the Kobalt, but no, even with all the rain we've had and the grass growing taller that the mower deck every week, it cuts right through it, no problem. And that's even while also driving the wheels.

I've got a big yard for the villages (.25ac). I could probably mow it three times on a charge if I wanted to. The only thing I don't like about it is the price -- it cost more than the heavy-duty, four-wheel-drive, Honda-powered mower I used in Texas. But even if this plastic mower only makes it through one season, I'm still money ahead over paying someone to do it.