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Quick update and conclusion. Yes, the outer contacts did end up being the common connection. With 7.4v fed in that fashion I was able to power on and test the radio. I wasn't sure on power consumption so limited it to 200mA, which worked fine to run the radio handset, but it would reset every time I tried to transmit. Very likely just needed more power, but could be a fault. At any rate, the basic question is answered (by myself), so no need for followups and consider this subject closed.
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