The RIDGID AC840041 18V 4.0Ah MAX Output EXP Lithium-Ion Battery features tabless cell technology delivering 3X more power in a compact size. Experience extreme performance in the toughest jobsite applications with RIDGID 18V MAX Output EXP Batteries. Tabless cells improve power delivery by creating a more efficient energy transfer leading to the best power, size, and weight ratio in a RIDGID 18V battery. Advanced Intelligent Electronics communicate directly with the tool to optimize performance in high demand applications when paired with brushless tools. Pair this battery with a 18V Turbo Charger (AC96099) to achieve 80% charge in 15 mins. ThermaGuard technology allows laser welded cell straps and upgraded heat sinks to run cooler and live longer through the most demanding applications maximizing overall battery life. To shield against the toughest jobsite conditions, this battery is constructed with durable reinforced housing. Work all day with RIDGID's most dependable, best performing battery. This RIDGID 18V 4.0Ah MAX Output EXP Lithium-Ion Battery is 100% compatible with all RIDGID 18V tools. This battery is backed by the Industry’s Best Lifetime Service Agreement, simply register within 90 days of purchase for FREE Parts, FREE Service, FOR LIFE. The AC840041 includes the 18V 4.0Ah MAX Output EXP Lithium-Ion Battery. Charger sold separately.