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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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