POWERFUL AND LIGHTWEIGHT Fits: WG180, WG280, WG380 and WG580 The 2.0 amp hour lithium technology charges quickly and powers your cordless WORX tool through the entire job, without waning or draining. Max lithium batteries are lighter, more efficient, and charge with no memory effect. Includes an indicator system to quickly and easily determine how much battery life remains. Charging time is about 8 hours with the WA3747 charger. (not included) 40V MaxLithium Battery - WA3580Fits: WG180, WG280, WG380 and WG580Battery indicator quickly shows how much battery life remainsLighter, more efficient, and charges with no memory effectCharging time = 8 hrs with WA3747 Charger (Charger not included)