We introduces the 18V 6.0 Ah and 4.0 Ah MAX Output Lithium-Ion Batteries and Charger Kit with Bag. MAX Output batteries facilitate battery and tool communication unleashing the full potential of any 18V Brushless Tool providing more power and more runtime. The Advanced Intelligent Electronics in MAX Output Batteries enable users to power through the most demanding applications on the jobsite. The 6.0 Ah MAX Output battery will provide up to 5X more runtime compared to the 1.5 Ah lithium-ion battery (R870015). Along with improved performance, the 6.0 Ah MAX Output Battery is also 23% more compact than the previous model (R8400806). The 4.0 Ah MAX Output Battery will provide up to 3X more runtime compared to the 1.5 Ah lithium-ion battery (AC870015). The MAX Output 4.0 Ah battery is compact and lightweight, which reduces user fatigue. The included 18V Charger is compatible with all batteries. As always, these MAX Output Batteries are 100% compatible with all 18V Tools.The AC840060SB1 Kit includes an 18V 6.0 Ah MAX Output Battery, an 18V 4.0 Ah MAX Output Battery, an 18V Charger, a bag, and operator's manual.