I just use a bigger diesel battery and attach the clips to the end of battery wires
one end is a fused on terminal that goes on the battery the other is a flat with a hole in it, that end gets the clamp the trick bieng as few rinkydink joins as possible
basically anything works but they end up breaking at the joins and letting you down when you need them
I dont bother with the boxed up toy versions I have tried a few and they suck
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