I have a set made from 2/0 welding cable about 30’ long, heavier than heck, but they never failed to start what I hooked them up to, even semi to semi.
Worked at a recycling center in the late 70’s and got the cable for scrap value maybe $10 at the time, bought the best clamps I could get, think they were $40 for all 4.
Still have them.