Fire Power Featherweight Lithium Battery Lithium Ion Polymer technology with Built-in LED test gauge Extremely lightweight, 50% to 70% lighter than standard batteries Battery weight 4.4lbs, Dimensions 6 9/16" x 4 7/8" x 6 7/16". 500 cca Fast recharge, can be brought up to a 90% charge within 6 minutes Long shelf life, up to 1 year before requiring recharging