Slimline batteries are up to 15% smaller than regular batteries and are a unique way to pack more ampere hours (Ah) in a confined space. So Mastervolt compact AGM technology also reduces pounds per Ah to provide a larger battery bank with a lower weight penalty. AGM batteries have an electrolyte that is made of water and sulfuric acid and is highly absorbed in the glass fibers. This battery has no need for maintenance and with a normal use does not cause gas production. Ideal and very slim universal battery; Also suitable for starter functions. Marineland brings the best.