TJ,
It's going to be equally important to know what the minimum resting battery charge (after any type of external charge has had time to dissipate) after a long stay at rest and after the batteries have been depleted.
Yes, you could have been over-charging with a charger that has too large of a capacity or a blunt garage charger and do damage. However, you could also be doing similar damage by depleting the batteries well below 12.0 volts with any repetition.
David
Earmark Marine
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