[bobcowan]

Lie everything else, there are plusses and minuses to using welding cable. Size for size, it carries the same volts as battery cable.

Welding cable is designed to be flexible; that is obtained by using finer wires and a differant covering. But, in a high vibration environment, the finer wires can break.

The covering is also differant. It's pretty tough stuff and should resist heat and chemicals just as well. But when it burns it can release toxic fumes - that's why it's not DoT approved. I'm not sure that's a big deal.

Life's full of trade offs.