So You Own An AGM Battery...
AGM batteries can sulfate just like any other lead acid battery. Other than by Ouija Board how would YOU determine if a battery has become sulfated and how severe is the sulfation, and if desulfation ...
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The theory would be over my head but I would look at increasing internal resistance as determined by a bench-test. Ideally you would keep track of each battery over time, but you could also use a new battery as a baseline.
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