Spiral wound batteries are essentially AGM (Absorbed Glass Mat) batteries or more commonly known as SLA batteries (Sealed Lead Acid). Unlike regular wet cell batteries, spiral wound batteries can be oriented in any position and do not need to be kept upright. This becomes ideal for sports, marine vehicles or aircraft where more vigorous travel conditions are expected.
In AGM batteries, the electrolyte are held in fibreglass mats unlike flooded cells found in wet cell batteries. AGM batteries are also known as dry cell batteries, non-spillable batteries, regulated valve batteries, or maintenance free batteries.
Despite of its construction, AGM batteries are the same as wet cell batteries in chemical composition. Both battery types contain the same lead and lead oxide plates soaked in sulfuric acid. As a consequence, both experience the same destructive sulfation process and can be optimized through desulfation.
Some of the companies that manufacture these form of VRLA batteries include but not limited to the following: