However I have too many roots, hills, and uneven surfaces. For someone with a postage-stamp type of lot, it might do the trick...

https://www.worx.com/landroid-m-20v-cordless-robotic-lawn-mower-wr140.html

I bought a new battery powered Stihl lawnmower and love it. It has two handles - one to keep the motor running and a second one which will propel the lawnmower forward. The 'self propelled' part has a variable speed option. If you have a large lawn, you can set it on a higher speed and march along without having to push it; if your lawn is small, I'd recommend the slower setting. My lawn is so small that I only use the self propelled part when returning it to the garage.

It has room for two batteries so you can easily swap them in the field. If your lawn is large, I highly recommend you buy a second higher voltage Stihl battery the same time you purchase the lawnmower. You may be able to negotiate a better price for the spare battery (they're expensive!).

The only con about this mower is that these two handles (one above the main bar and one below the main bar) are spaced pretty far apart so if you have small hands, like I do, it can get tiring holding on to both handles for any length of time. (The designers/engineers were most likely male, with large hands. Hello, Stihl?)

for another electric tool, so we would only need to buy the mower itself. Unfortunately, their prices seem to have gone up from when I first checked.

Looks like Black&Decker and GreenWorks are best buys now, but I haven't tried either one yet. They use different batteries -- even different voltage -- from eGo.

They have both self-propelled and push models.

I bought a push model 2 years ago and am totally satisfied. It comes with 2 - 80 volt batteries and a charger and does the job on my 1/2 acre sized lawn. It is easy to operate and is very light weight and easy to manage and push.

I considered a self-propelled model - but in the end thought the additional cost was not justified.

While one battery is in the mower and being used - the other is in the charger being re-charged. Recharging takes about 20 to 30 minutes. Which is just about the same time I get from a charge depending on the height of the grass and whether it is dry or damp.

Got to do some assembly this PM.