The 10.0Ah ARC Lithium™™ Battery is the industry’s most powerful battery. Fully equipped with an upgraded fuel gauge. The 10.0Ah ARC Lithium™ Battery is the industry’s most powerful battery. Fully equipped with an upgraded fuel gauge, the 5 segments which wrap the power button shows you how much battery power you have left in 20% increments. The ARC Lithium™™ battery technology is the industry’s most advanced; equipped with patented Keep Cool Technology; which keeps the cells cool and prolongs the life of the battery. This battery packs 560Wh, and will provide this constant energy until the power is drained, meaning you won’t experience any loss of power as the battery depletes. For this battery, the charge time with the standard charger is 190 minutes, and 70 minutes with the rapid charger.