YTZ12S Z12S Lithium Ion Sealed Powersports Battery 12V - 300 CCA - NO Spills, Fully Charged and Activated Ready to Use (MMG4) Less volume and weight: 1/3 of normal lead-acid battery Exceptional cycle life: more than 2000 cycles under JISD standard (lead-acid battery 150-300 cycles). No maintenance needed for almost a year. No pollution: safe for the environment. Does not contain any acid and heavy metals such as lead, cadmium, or mercury Incredibly fast recharge rate