Re: Voltage puzzle
Gary, if it is ten years old, guaranteed it has drited out of calibration. As the Mad hatter said "But it was the best of butter!" and even the best components shift as they age.
If you had one bad cell, that should have been reflected in a significant change in the voltage measured from that battery, and a calibrated meter should have picked it up.
I know, "should". If the turkey baster works for you, great. I found that calibrating my meters was cheaper than replacing anything the acid splashed onto, acid loves me but I have different feelings about it.