Yuasa AGM high performance maintenance-free batteries have absorbed glass mat (AGM) technology and provide you with greater cranking power with 12 extra plates per battery over your standard AGM battery. Yuasa's advanced AGM high performance maintenance-free batteries are the prefect fit for people who have better things to do than battery maintenance. They are permanently sealed, never need refilling, and are the perfect battery for your 2009-2018 Yamaha VMAX. Yuasa AGM high performance maintenance-free batteries feature a spill-proof design, which means that there is virtually no possibility of leaks. These batteries feature advanced lead-calcium technology that pumps up starting power. They also hold voltage longer and need less charging in standby or storage modes, like during winter storage.