The MILWAUKEE M18 REDLITHIUM FORGE XC6.0 Battery Pack delivers HIGH OUTPUT 12.0 power in a smaller size, 15-minute supercharge up to 80%, and the longest life vs REDLITHIUM batteries. REDLITHIUM FORGE are Milwaukee's most powerful, fastest charging, and longest-life batteries. The REDLITHUM FORGE XC6.0 delivers the same power as the M18 REDLITHIUM HIGH OUTPUT HD12.0 in a smaller size and lighter weight design. The optimized combination of size, weight, and increased power provides the best solution for power-demanding overhead work and tight work areas.