I made some jumper cables out of welding lead, so I could make long ones that would jump a diesel. It's a little thick for battery cable, but maybe they make something smaller.

Problem is buying them. New are expensive. Buying by the foot from an electrical house, wouldn't be bad.

I have a buddy that's an electrician. I was gonna replace my ends but this is motivating to replace the whole cable.

My starter ground is a ground strap for a commercial application, works great.