I took a chance on the Ryobi mower since I have some other Ryobi tools and like them.
Note: the mower uses 40V batteries and the hand tools use different (18V) batteries. -Edited to correct this
Ryobi has a push mower and a more expensive, heavier, propelled mower. I got the cheaper one.
It comes with a charger and one battery. The mower has a place on top of the body for the battery to snap in, and a second slot for you to carry around a spare battery if you wish.
Also note, the Ryobi batteries are available with differing storage capacities (Amp hours). I did not know this and bought a second battery with smaller Amp hours. It is less expensive and does not run as long. I might pick up a bigger one during this sale.
The mower comes with a bag to catch clippings, and a "mulch plug" that you insert if you are not using the bag. If you haul the new mower to your family member's house to mow their lawn and forget to bring the plug, you can rig (against warnings of course) it to exhaust the clippings without the plug. But don't do that, you'll probably die if you do.
If mulching, the clippings do not exhaust to the side, they stay in the path you are cutting and this seemed to make the yard a bit tidier.
I was skeptical about the cutting power, especially since I was helping out someone with a yard with high grass and weeds, but the mower did better than I expected it to. It even shredded an aluminum can that I ran over because I did not see it. The cutting height is adjustable.
The batteries have a button you can press to see how much charge you have left. I have not had the mower long enough to get timings on how long it will run. There is not an appreciable warning that the battery is about to run out. It just stops after maybe 15-20 minutes or so.
The wheels are plastic. The body has two handles that make the mower easy to lift. I believe when I was putting it together it looked like you could fold the handle down to make it easier to transport somewhere.
It's not as loud as a traditional mower. It does have a light on the front. It cuts while it moves forward and also if you pull it backward in case that is important to you.
I think the cutting deck was something like 20", so it's a small mower, but for a small yard, I thought it did a good job.