Our 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. This lithium-ion battery has the longest life, the most recharges, and the best performance over the life of the battery. It is also designed with resistant housing for increased protection against exposure to common oils, greases, and solvents. Built-in REDLINK Intelligence protects the battery from overloads, preventing you from damaging your cordless power tools in heavy-duty situations. The REDLITHIUM FORGE XC8.0 battery is fully compatible with 275+ M18 solutions. Our M18 & M12 Rapid Charger charges battery packs up to 40% faster.