Dry Battery Terminals
Most cylindrical dry batteries (such as the AA battery) have a projection at one end (positive) and a flat base (negative). These mate with metal strips or springs in the battery holder.
Six volt lantern batteries typically feature two coiled, cone-shaped spring terminals, designed to mate with flat contact plates on the inside of the battery compartment. Some lantern batteries instead feature screw terminals, while still others instead feature pin holes.
Nine-volt batteries have snap-on connectors.
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