Oh, OK, didn't know you were a guru. Reminds me of Edison saying he had done 50,000 battery experiments before choosing the materials to design the 'Edison' cell. Tesla responded ".....I was almost a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor." Then again, I have always personally believed a person who spend many years on a honeywagon (a septic system draining truck) really knew his / her $hi!, if you know what I mean.
To any others looking on, resting voltage is not a very accurate way to measure state of charge in lead- acid batteries. Among other variables, the relationship between resting voltage and Electrolyte density is better but impossible to do with unless one has access to each cell and the electrolyte is liquid (the way this is measured it to draw off some fluid into a chamber with different colored balls (Easy Boys! only one is blue!) and see which ones float. There table on the vial to read state of charge based on which balls float).
Brian (not a guru, not even close. I know this based on years of learning from gurus, most dead but all brilliant)
I'm basing it on my acquired knowledge throughout the years. 12.6 would be fully charged. This is of course assuming there is no surface charge, giving a false reading. Guru here. At least some stuff.