Lithium Ion Sealed Battery Powersports Replacement for YTZ5S PTZ5S GTZ5S CTZ5S (MMG1) 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. Incredibly fast recharge rate No pollution: safe for the environment. Does not contain any acid and heavy metals such as lead, cadmium, or mercury No hassle returns, if you haven't damaged the item you can return it for any reason