I just received this set and have not connected it to my old charger yet. They are large enough to be used as the ends of automotive jumper cables and have fairly strong springs. The gripping teeth aren't very sharp, but I think the large size and spring pressure should make up for this easily. The file would alter the teeth but I won't go that far unless I have a lot of issues which, like I said, I doubt they will. The half moon connection looks solid and there is enough room in the handles to add a short/small screw and copper washer if needed. I'm sure they will survive the charger and then be reused somewhere else. They are simple and strong, for now I am very happy with all aspects of this purchase.
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