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AGM batteries are also sometimes called "starved electrolyte" or "dry", because the fiberglass mat is only 95% saturated with Sulfuric acid and there is no excess liquid.
AGM batteries main advantages are no maintenance, completely sealed against fumes, Hydrogen, or leakage, non-spilling even if they are broken, and can survive most freezes.
AGM and gelled should be equalized 2-4 times a year at most - check the manufacturers recommendations, especially on gelled.
AGM technology has become the next step in the evolution of both starting and deep cycle sealed batteries for marine, RV, and aviation applications.
In AGM sealed batteries, the acid is absorbed between the plates and immobilized by a very fine fiberglass mat.
In addition, AGM technology batteries can be charged at normal lead-acid regulated charging voltages, therefore, it is not necessary to recalibrate charging systems or purchase special chargers.
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