The Milwaukee Tool M18 REDLITHIUM FORGE XC6.0 Battery Pack delivers HIGH OUTPUT 12.0 power in a smaller size, a 15-minute supercharge (up to 80 percent), and the longest battery life versus REDLITHIUM batteries. The size, weight, and increased power provide the best solution for power-demanding overhead work and tight work areas, says the company. Additionally, built-in REDLINK Intelligence protects the battery from overloads, preventing users from damaging their cordless power tools in heavy duty situations.