I availed myself of the two of $5.50 multimeters for sale at Harbor Freight and reliably confirmed that my battery does produce a solid 12 volts.
Actually, it's more like 12.87 and seems to be falling gradually.
I put the charged battery back in the car and it started a ran just fine. No weirdness. While running, I read a solid 14.8 volts from the terminals.
Shutting it down, the voltage starts to fall measurably.
I believe that this indicates a failing battery. I suspect that it's been on the verge for a while and the extended "park" just prior to the holiday break allowed it to fall past the critical point.
If predicted snowfall doesn't bury us tomorrow and beyond, I'll head out and check it again.
Unfortunately, I didn't budget for a battery this week, so it will have to remain in its present state for another week or two.
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