Milwaukee M18 18V Lithium-Ion REDLITHIUM FORGE 8.0 Ah Battery Pack with M18 18V Dual Bay Simultaneous Super Charger delivers high output 12.0 power in a smaller, lighter design that maximizes runtime and efficiency. This advanced battery pack features the COOL-CYCLE Active Cooling System, providing high-speed cooling to reduce downtime during demanding applications. With the M18 Dual Bay Simultaneous Super Charger, it achieves a rapid 35-minute supercharge to 80%, allowing you to get back to work faster than ever. Designed for durability, the battery pack resists exposure to oils, greases, and solvents, ensuring long-lasting performance. REDLINK Intelligence protects against overloads to keep your cordless power tools safe during heavy-duty use. Fully compatible with over 275 M18 solutions, this charger can simultaneously charge two M18 batteries using adaptive charge distribution to optimize charging efficiency. This combination the longest life, most recharges, and overall performance throughout the battery’s lifespan. Model Number: 48-59-1881SC