For what its worth, the 80B and 125B are probably essentially the same ESC and use the same FETs (which means they have the same working voltage) except the 125B uses more of them to handle the extra current, hence the longer packaging. Unfortunately, the FETs don't come off the heatsink easily (I know, I tried) to verify this. As long as you use the ESC properly and stay within it's rated voltage and current, Quark has to honor their warranty. If they say the 80 will handle 6s, then it should.

just like my 12020 should work properly, lol! i understand that it "should" work on 6s, but ChC has tried that with two different 80b units with some success. the first one fried and the new one stutters or something on takeoff. i just don't want to have to buy another speed controller for my truck, that would total 3! i will use your advice from other posts regarding heatsinks, and i have 4 5v fans at my disposal. i'm sure i'll be impressed!

another question for BrianG, when i send my 12020 back do you think bk will put new power wires on it if i request, 2 instead of 4. i'm sure i'll have to pay.

Um, RCM Mike or one of the mods may be able to answer that better. I don't see why not since they have it apart anyway...

The point I was trying to make earlier is that you shouldn't have had to buy three controllers. When the first one went bad running within specified parameters, it should have been covered under a warranty. These ESCs are expensive to buy one after the other!

for sure! i dont know if my 12020 will be covered or not. it should be, since i didn't exceed any of the controllers limitations. we'll see. i've heard good things about bk's customer service. thanks.

Only thing about BK's customer service is that lately its taken a long time. Mike might be able to fix your ESC though. And I'm sure he would be able to put one 12g wire instead.

nice! i'll send him an email.