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Second the motion on the Optima. Hid mine in a Ford case and accommodated the taller version by leaving the bottom open, it's hidden by the tray in both the '39 and the '47.
For me, the extra cost is more than offset by the long life and the reliability. As others have said, it's not unusual to get 7,8, or 9 years out of these.
My experience, however, is limited to 6 volts....have no experience with 12 volts.
Dick.