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The Boy Mechanic, Volume 1: 700 Things for Boys to Do · Chapter 350Wire Terminals for Battery Connections
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Cotter Pin Wire Terminal.
Good connections on the end of wires for batteries can be made from cotter pins, Fig. 1, about 1-1/2 in. long. Each end of the wire is put through the eye of a cotter pin, twisted around itself and soldered. The connection and eye are then covered with tape as shown in Fig. 2. When connecting to batteries, spread the pin and push the parts under the nut with one part on each side of the binding-post. When the nuts are tightened the connection will be better than with the bare wire.
Contributed by Howard S. Bott.