Dang it's HOT outside today.
Just got back in from testing. This thing will definately cut!

Even the big stuff.
About 20 minutes into mowing the right cutter head began starting and stopping, and generally acting erratic. Then the "Mystery" 80 amp ESC let out the smoke. UGH! POS!
I researched this esc before it was installed and couldn't find information on weither or not it had an internal bec. I'm thinking it does and this may have been the cause of it's death.
The other ESC is a RC Smart 80amp esc and is definately opto. It performed like a champ. In fact, it has some really desireable things built into it. If you hit something really hard and stop the blade, this ESC will shut off. It wasn't thermaling, because it ran cool. Then just turn it off, and back on again. Ready to go again. Cutting head motor temp is fine.
After about an hour of mowing and playing around, I was about to melt.
Cell voltage at rest is 3.82 after an hour of running. 20,000mah on 4S total.
Cutting head speed is good.
One thing I don't like about this setup, it's too bouncy.
To stiffen up the front, I replaced the shock oil with silicone. This makes the front end like a straight axle.
There's more weight in the front, than in the rear. Hmmmm............I'll have to work on this.
Time to get another ESC on order. I'll have time to think about this.
Any Suggestions guys?