Seems to be working fine so far. They are good quality and I haven't had any problems with the ones I've used. I have used small alligator clips soldered to wires connected to 18650 batteries for various toys and projects. (Do this at your own risk. I do not advise anyone to solder or play with them. Lithium ion batteries! Many try at home.) My picture shows only one of each type, but rest assured you will be red and get black colors . any size. The only thing I would change is the plastic lids for a higher melting point material. Or maybe I'm just bad at soldering. Anyway for the price I'm happy with the purchase and would probably take them again if I ever use them all.
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