Thank you both so much. Would you know it, it did correct itself on it's own today.
Previously, even though the battery was full according to my charger and should be full as it had been charged so long, it stayed on 10% and the alternator output was high compared to uaual.
The alternator never charged it more than ~20A, neither did the external charger by much. I have used a clamp meter to test the current a lot.
I will check the internal resistance reading again when it has settles. It is an AGM battery, apparently they should be lower internal resistance than flooded cell, but mine has always been 4OHM.
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