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The majority of Valve-Regulated Lead Acid (VRLA) batteries on the market or being manufactured today are AGM batteries. The electrolyte is immobilized by a micro-fibre glass mat. Their usable life usually runs between 5 and 10 years, with a cycle life rating between 200 and 500 cycles (80% DOD). Their life is restricted by the increase of internal resistance and, consequently, the drop of the capacity. Often, a part of the battery fails by sulphation of the negative plate.