RIDGID introduces the 18V Lithium-Ion MAX Output 4.0 Ah Battery with 18V Lithium-Ion 4.0 Ah Battery. MAX Output batteries facilitate battery and tool communication unleashing the full potential of any RIDGID 18V Brushless Tool providing more power and more runtime. The RIDGID MAX Output 4.0 Ah battery will provide up to 3X more runtime compared to the 1.5 Ah lithium-ion battery (AC870015). The advanced electronics in MAX Output batteries enable users to power through the most demanding applications on the jobsite. The RIDGID MAX Output 4.0 Ah battery is compact and lightweight, which reduces user fatigue. As always, this RIDGID MAX Output 4.0 Ah battery is 100% compatible with all RIDGID 18V tools. Bulk Packaged