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The VRLA (valve-regulated lead-acid) products use the AGM (absorbed glass mat) technology.This means that AGM mat is applied to separate the positive and negative plates, absorb electrolyte. Electrolyte immobilizationwith AGM separator that continues to maintain firm contactbetween the plates within is a key requirement for VRLA batteries.The use of AGM mat as separator allows easier transfer of the oxygen gas (evolvedat the positive plate during charge) to the negative plate, then recombine with the hydrogen creating water and preventing water loss.