no mid-range throttle

[BrianG]

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.