AGMs are still lead/acid batteries so the chemistry is the same. The big things to remember is no equalization as the electrolyte (acid) cannot move; second is all manufactures recommend an maximum charge rate of 10 to 13% of the amp-hr rating of the battery bank for the longest life. So, 55 amp charger would handle a 420 to 550 amp-hour battery banks.. The reason for this limit is the electrolyte can not move, so local overcharging can occur. This means out gassing can occur (water loss) because of the slow oxygen and hydrogen recombination. Water loss in AGMs results in a loss of battery capacity.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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