Phil,
The statement is too broad to answer. My voltage gage in the truck runs at about 13.5 so it is in line with your statement. I would say I do not want to see a battery over 13.8 volts, however, one down to 11.5 volts can still be considered functioning correctly. It depends on what "job" the battery is doing. Voltage is only half the question that needs to be asked. The other half is what is the reserve (cracking) amperage left in the battery.
I was going to go off on a tangent about POWER but decided not to unless someone want DC .001 theory.
Cheers,
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