RIDGID introduces the 18V 8.0 Ah MAX Output EXP Lithium-Ion Battery with (2) 4.0 Ah Batteries, Charger, and Bag. Experience extreme performance in the toughest jobsite applications. RIDGID MAX Output EXP batteries utilize advanced intelligent electronics to optimize performance by creating a communication system between both tool and battery. MAX Output EXP features ThermaGuard Technology which combines oversized heat sinks with advanced intelligent electronics to keep the battery running cooler, prevent overloading, and protect individual cell performance. To shield against the toughest jobsite conditions, this battery is constructed with durable reinforced housing. This set also includes two 4.0 Ah Batteries, an 18V Charger, and a Bag. As always, these RIDGID Batteries are 100% compatible with all RIDGID 18V tools. Best of all, these batteries and Charger are backed by the Industry’s Best Lifetime Service Agreement, simply register within 90 days of purchase for FREE Parts, Free Service, For LIFE.