I am guessing that you don’t still have the remains of the mower?
It would have had the right sort of speed controller, and a brain or controller, to make it all work?! If you can find out from Yardforce what controller and or esc, (may well have been a vesc too!,) then you might be able to rework into a replacement system? The mower should have had forward and reverse, to enable it’s autonomous activities. It would be disappointing if they had built it all onto one master board, as then its more of a problem to separate/hijack the parts. Good for experimenting.
As geofrancis has said, there are many more options. hoverboards, electric bikes, and brushed gear motors, etc…
I came back after reading this thread a day or two ago to suggest that the iFlight Blitz series of ESCs might work (80A, 12S, single or 4-in-1 packaging), but after catching up on the rest, that seems a bad suggestion.
If it were my project, I’d lean heavily toward a sacrificial VESC driven hoverboard as the power plant.
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