RIDGID introduces the AC840040 18V MAX Output 4.0 Ah Lithium-Ion 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. This battery will provide up to 3X more runtime compared to the 1.5 Ah lithium-ion battery (AC870015). The Advanced Intelligent 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. Best of all, this battery is eligible for the Industry's Only Lifetime Service Agreement, simply register within 90 days of purchase for FREE Parts, FREE Service, For LIFE. Charger sold separately.