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Batteries with weak cells typically show normal voltages straight off the charger.
It’s when you apply a load that they plummet.
grams-
What I am firstly trying to see is if the charger (automatic) can get the battery 14.4/13.8 volts. Then leave the battery off charge to see what the battery settles to, hopefully around 12.8v.
Then you can start diagnosing what the problem could be. Even a battery load tester, both mechanical and electrical needs the battery to be charged.
lynx
Take battery off and charge it. See what the charger gets too.