Lawn mower melting near battery

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This is my second lawn mower that is doing this. 1st one was replaced under warranty last year.
56v 20in deck  

The flat spot in the battery compartment has something round under it that gets hot and starts melting the plastic.  Smoke will come out of the battery compartment.  

Is there a way to stop this part from melting??
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Posted 3 years ago

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(a)Typical Engineer

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Official Response
I'm pretty sure the motor sits directly under that spot, and the black contraption in the picture below is the motor controller, which sits dead center above the motor.  The round coil wrapped in copper is a coil.  Here is a description about what I know about the wiring harness:

1) The power comes from the battery via the RED/BLUE/BLACK wires that go towards the left.
2) The huge block resistor is mounted to the side of the motor case, and it connected between the motor controller and the wiring harness that runs up the handle
3) The motor is connected at the white terminal posts at the back of the picture
4) The wire harness that goes from the motor controller takes care of the safety features (handle extended/folded), as well as the on/off (start/stop).

It's a relatively simple setup.  Also, there are additional pictures and background as to why I have my 20" mower torn down this far in this thread: