I picked up one last spring off CL for $150 with a battery, it's been a nice reliable mower for all of last year and the one mow I have done this year. Liked it enough I spent the $200 for retail of the string trimmer to go with it. I use around a battery charge for the front yard, and one for the back yard. But this is Texas and I have a decent sized yard.
OTOH, I did notice one peculiarity of mine, which might be relevant here. When you fold the handle up into the operational position you'll notice on one side it goes over and depresses a little button on the side of the bracket. That's a safety to make sure the handle is fully up and engaged before allowing the mower to power up. Mine wasn't pushing that all the way down at first, and it caused it to go a little then power off, or not to power on at all. A tiny bit of tinkering to tighten up that button and make sure it was fully depressed and POOF, easy peasy! No more stalling/not turning on... Pic of button :
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The way I tested it before screwing around with the bracket was that I put a piece of cardboard between the handle and the button to make sure it was "extra pushed in" and suddenly everything worked.