I really like the idea of a cordless electric lawnmower, but the cost is so prohibitive. My corded electric mower I got for cheap over a decade ago is still going strong.
I have one. The cheapest Ryobi model. It works great.
My yard...s are discontiguous. The front yard is fully separated from the back yard by my house, with only a narrow alley in between that and my neighbor's house, and the back yard is fully enclosed with a fence. Then we have the "way back" behind my garage and shop, the forecourt to which is completely paved. Many obstacles are in between. Getting an extension cord out to all three locations would be a monumental pain in the ass.
If you need batteries, just buy the knockoff ones from Amazon. They're fine. The "brand name" Ryobi batteries aren't any less shit, but the price they try to sell them for is beyond audacious.
I dunno. I bought mine because I needed a mower, it was there, and I put it in my car. Competing offerings are available. I have no idea of Ryobi mowers are actually good in any objective sense or compared to others, but I think I paid $179 for it and it's worked well for me.
20", I think. I bought it several years ago. I don't think that same model is available anymore.
It was the most basic one they offered at the time. No self propel, and it doesn't even have a side discharge chute. Mulch or bag only. I just run it without the bag.