Of lot of interesting links. Of course, none are relevant to the discussion.

The discussion question revolves around the voltage of a fully charged battery.

When evaluating battery charge to determine whether the charger has done its
job, the voltage you want to achieve is 2.2 volts per cell, or 13.2.

If you are disconnecting a charger when you get to 12.6, you have not fully
charged your battery. If your charger cannot raise the voltage above 12.6, you
have a bad charger or a failing battery.

Several hours later the state of charge may deteriorate from 13.2 to 12.6. Your
quote from Nigel Calder says that it might take as long as "overnight" for the
battery to self-discharge to 12.6.

The final .6 volts are there in the beginning, when the battery is *fully*
charged, and before it drops off to the lower number.
Therefore, a fully charged battery is 13.2 unless the final .6 volts can be
shown to be a mass hallucination.

There is no logic at all in a position that says the battery is not "fully
charged" until the reading declines .6 volt.