Absorbed Glass Mat (AGM) batteries look different from typical powersports battery types because they are built differently. This advanced battery design eliminates water loss. Once these batteries are filled with acid, youll never need to fill it with water or check the acid level. This specific line is optimized to run strong without maintenance. Essentially this is the ultimate set it and forget it battery. This AGM battery line is virtually maintenance free. All of the acid is absorbed in the special plates and separators, so you never need to worry about acid leaks harmful acid leaks. This proves especially crucial for vehicles where acid leaks could occur such as ATVs, watercraft, and motorcycles.