Les, right you are about the F3 having an LCD meter display, not LED. As for my comment re: FM3a, 'Fantastic camera in so many ways...except low-light meter reading', I was referring to the general inability of anyone to read the meter in low light since the meter is not illuminated. The meter, itself, has no problems metering low light.
I'm unsure what to make of Derek's cryptic response. The original question asked which cameras offer both of the following features: 1) aperture priority, with batteries, of course and 2) the full range of all shutter speeds without batteries. Thus, none of the bodies Derek mentioned meet the criteria.