Boat cable, 1/0. It is pre-tinned so it holds up well against corrosion for many years, very flexible insulation, good stuff. Mine are about 20years old now, still work great and are flexible, started a friend's car with no battery in it last winter (diesel excursion). The clamps I used are heavy steel clamps, insulation dipped or something, have replaceable copper jaws with lots of clamping force. I don't know where to find them again, bought through a catalog at the time, they were listed as truck-jumper clamps.

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Gone to the dark side

- Jeff