RIDGID introduces the AC840040 18V MAX Output 4.0 Ah Lithium-Ion Battery. MAX Output Batteries are RIDGIDs most powerful and longest running batteries. 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). Pair MAX Output batteries with RIDGID tools for maximum power in any application. The advanced electronics in MAX Output batteries enable users to power through the most demanding applications on the jobsite. Our innovative cooling technology extends battery life in the face of extreme use. 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.