RIDGID introduces the new 18V Lithium-Ion 4.0 Ah Battery. This 4.0 Ah Battery will provide up to 3X more runtime compared to the base Lithium-Ion 1.5 Ah Battery (R870015). This Lithium-Ion 4.0 Ah Battery is 10% more compact and 10% lighter compared to the previous model (R840087). Best of all, this Lithium-Ion 4.0 Ah Battery is 100% compatible with all RIDGID 18V tools and chargers, and with registration, this Lithium-Ion 4.0 Ah Battery is backed by the RIDGID Lifetime Service Agreement. The 18V Lithium-Ion 4.0 Ah Battery includes an operator's manual. Charger sold separately. Compact size reduces user fatigue Fuel gauge displays power level on the job 3X more runtime compared to the 1.5 Ah Lithium-ion battery (R870015) 100% Compatible: works with all RIDGID 18V batteries, tools, and chargers Includes: (1) AC87004 18V Lithium-Ion 4.0 Ah battery and operator's manual Charger sold separately RIDGID: Build for a Lifetime