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An AGM battery is a 12-volt car battery that can be used as an alternative to traditional flooded lead-acid batteries. The Valve Regulated Lead-acid batteries include AGM and gel technology. These are also known as SLA. The fluid in a lead acid battery is called electrolyte, a mixture of sulphuric acid and water. Flooded lead-acid batteries require regular maintenance by adding distilled water. These batteries operate by producing an electric charge when the sulphate in the sulphuric acid becomes bonded to the lead in the battery. The electrical charge is replenished by reversing this reaction resulting in the sulphate going back into sulphuric acid. When your battery charges, the electrolyte heats up and some of the water evaporates. During a process called electrolysis, the water breaks down into hydrogen and oxygen gases that dissipate. The level of electrolyte becomes lower in the battery and it becomes necessary to add some distilled water until the proper level is restored. The electrolyte should cover the battery plates. Modern sealed "maintenance free" batteries do not have removable caps allowing you to replenish lost electrolyte. Although electrolyte is lost over time due to some venting, very little is lost in comparison to traditional batteries. A special calcium alloy of lead is utilized in maintenance-free batteries to sustain the water for an extended period. When a maintenance-free battery starts to lose its capacity to hold a charge, it’s better to replace it with a new one. Whereas, in the case of conventional batteries, you can add distilled water to recover electrolytes in plates. Most of the time when you purchase a modern Maintenance Free battery it will be an AGM battery. An AGM battery is a 12-volt car battery that can be used as an alternative to traditional flooded lead-acid batteries. The Valve Regulated Lead-acid batteries include AGM and gel technology. These are also known as SLA.