The MILWAUKEE M18 REDLITHIUM FORGE XC8.0 Starter Kit delivers HIGH OUTPUT 12.0 power in a smaller size and the longest life vs REDLITHIUM batteries. REDLITHIUM FORGE are Milwaukee's most powerful, fastest charging, and longest life batteries. The REDLTIHIUM FORGE XC8.0 delivers 8 amp hours of runtime, but with the same power as the M18 REDLITHIUM HIGH OUTPUT HD12.0 in a smaller size and lighter weight design. The lithium-ion battery has the longest life, most recharges, and best performance over the life of the battery. Designed with resistant housing for increased protection against exposure to common oils, greases, & solvents. Built-in REDLINK Intelligence protects the battery from overloads, preventing damage to cordless power tools. The REDLITHIUM FORGE XC8.0 battery is fully compatible with 275+ M18 solutions. The M18 & M12 Rapid Charger charges battery packs up to 40% faster, reducing downtime and maximizing productivity. The battery charger accepts all M18 and M12 batteries, providing a charging upgrade for both systems. The battery charger communicates directly with your battery pack to monitor cell voltage, temperature and charge status to ensure a full charge.