Originally Posted by OldNick
That battery is identical to the one I am using, though mine was sold under another brand name. It does require the plastic ring to keep the proper parts in contact to make up the circuit. I would advise Spotmatic owners to keep the plastic ring when replacing the battery, in case one has to use a battery not sold with the proper ring.
Mine also has the plastic ring on it. I think the ring came with the battery.