[Bigdav160]

I've got to disagree with you Tom.

Although a hydrometer is more accurate, 12.3 volts is a discharged state. Close to 50%.

Starting at 12.3 volts is going to result in a lower cranking voltage. 9.6 volts is considered acceptable but higher is better. Even the best, freshest, batteries usually cannot support 11 volts or more while cranking.