Ultra high cranking amps from a super-lightweight battery. Only 1/3 the weight of a lead acid battery Built-in charge and equalizing protection prevents battery from over-charging Remarkably low self-discharge for extended storage periods up to one year Suitable for low temperature environments More than twice the service life of conventional lead acid batteries Superior vibration resistant construction allows multi-directional installation without damage No corrosive liquids, no toxic heavy metals make Twin Power Li-On batteries environmentally friendly Direct fit for OEM applications with no shimming or adaptors required Heavy duty terminals in stock configuration for easy installation and long lasting performance 2 year warranty Note: Requires specific lithium ion battery charger/maintainer, 805-180, sold separately