Firepower Lithium Featherweight Batteries by WPS.

Extremely lightweight (typically 2.0lb or less versus 8 to 15lb on lead acid batteries), higher cold cranking amps (cca) and longer shelf life. Lead-acid batteries will drop about 1% a day while a good Lithium battery will only loose about 10% over an entire year.
These FirePower Lithium Polymer (LIPO) batteries allow the use of any regular charger / tender (never in desulfation mode), as long as it has a maintenance mode, and the batteries come with a 2 Year Warranty.
Tip: When sitting for a while and in colder temperatures, "wake up" the battery by turning on the headlight for a few moments. The battery will come to life and start putting out those higher cold cranking amps.

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Lithium Batteries