You are correct that a fully charged 12 volt lead acid battery will read 12.5-12.7 and if it reads 11.5 it is totally dead for all practical purposes. Even 12v would be consider too low to do much. This is open circuit voltage,no load and no charge having been applied for some time as that will leave a surface voltage. The surface voltage from charging can be removed by applying a load like turning on the lights for 15 seconds or so to get a correct reading.
As far as voltage while cranking, you normally consider about 10.5 volts being minimum for good action.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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