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The AGM battery and the standard lead acid battery are technically the same when it comes to their base chemistry. They both use lead plates and an electrolyte mix of sulfuric acid and water and have a chemical reaction that produces hydrogen and oxygen as a byproduct. The flooded lead acid battery (FLA battery) uses lead plates submerged in liquid electrolyte. In a conventional FLA battery the gases produced during its chemical reaction are vented while the AGM is a sealed battery, there’s minimal to no vented gasses. Gases produced during the chemical reaction in an AGM battery are recombined with the electrolyte. The AGM battery is maintenance-free and can be placed in more enclosed areas such as vehicles with batteries in trunks and under seats. The AGM battery tends to be built harder than the flooded lead acid battery, as it originally served military and aviation use. Due to their design they are shock and vibration resistant. The AGM battery’s internal resistance is among the lowest of the various lead acid batteries. While a new flooded lead acid battery can have an internal resistance of 10-15%, a new AGM battery can be as low as 2%. Low internal resistance translates to increased battery voltage output. It also means a reduced loss of heat as power circulates in the system. AGM batteries have an 80% depth of discharge (DoD), which is better than the 50% DoD offered by a flooded cell battery. This makes the AGM battery well-suited to deep cycle applications. Depth of Discharge indicates how much battery capacity can be discharged safely without damaging it. == Comparison ==== Comparison AGM and Gel ==== Terminology =='''Flooded Lead Acid''': The flooded lead acid battery (FLA battery) is the most common lead acid battery type and is often referred to as a standard or conventional, or even a wet cell battery. '''Sealed Lead Acid''': Also known as VRLA or Valve Regulated Lead Acid battery. These are Flooded Lead Acid batteries that uses a one-way valve to regulate pressure resulting from internal chemical reactions. You can not perform maintenance on these batteries by adding additional liquid electrolyte or water. Deep Cycle:AGM:Gel-Cell:EFB:Lithium: