RIDGID introduces the AC87004P 18V 4.0 Ah Lithium-Ion Battery 2-Pack. These 4.0 Ah batteries will provide up to 3X more runtime compared to the 1.5 Ah Lithium-ion battery (AC870015). These 4.0 Ah batteries are 10% more compact and 10% lighter compared to the previous model (AC840087). As always, these 4.0 Ah batteries are 100% compatible with all RIDGID 18V tools.