Living up to its name, the Yuasa Maintenance Free Battery gives worry free starting for your motorcycle and ATV through its tough and stable lead calcium design that allows for sustained performance over a long period of time regardless of inactivity. Absorbed Glass Mat (AGM) Technology is an advanced battery design used in Yuasa's Maintenance Free Batteries that eliminates water loss. So you'll never need to fill it with water or check the acid level. Features: Comes with pre-measured acid tubes that easily empties into battery. Includes a seal that is then placed across top of battery to create a sealed, spill-proof battery. Never needs refilling but may need periodic charging.