After being driven ~15-20 minutes yesterday, today the battery is 12.3v at rest at 60F, with electronics and headlights on and engine off, it's at 11.7v. It may not had been fully charged after a 15-20 min drive. I should drive it for longer (~30 min), rest, and test again. My multimeter doesn't do min/max. When a friend comes over I can have him crank the engine and while I watch how low the voltage drops. I suspect this battery is borderline and should be replaced.