Quark fried, blown capacitor...

It's funny (not) but there seems to be a lot of variation from MM to MM with regard to what they can handle. Some will do 5S, some won't. I have one particular MM that I can run all day long on 4S with the 7XL in a truck and not have any problems with thermalling. It may not be a QC issue, but all MMs are definitely not created equal.

[jhautz]

where do you solder these caps? I was wondering if they could be put in near the plug end of the power wires, or do they need to be as close to the board as possible, or doesnt it matter?

I'm assuming positive lead to positive wire and negative to negative. That brings another question... How do you know which lead is positive? If I remember from way back in high school electronics class on capacitors the positive lead is a bit longer than the negative, or are they marked somehow?