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if it’s an alligator clip it is probably non original ,
you might find some batteries that used these Fahnestock clips


the clips could have been on the original battery cells ( and could have been removed from the original batteries)

also some radios may have these clips on the chassis or on the back cover , used to hook up the antenna and/ or the ground wire to the radio.
You’ll have to trace where the wire goes to figure that out. I suppose they could have been on a terminal strip to connect your batteries to as well.
Im glad Ed is helping, he has much more knowledge of radio electrical than myself.

i think the alligator clip came later, but could be wrong. usually if you see those its something someone added, “I think”