The Milwaukee M18 REDLITHIUM FORGE HD12.0 Battery Pack delivers 50% more power than the HIGH OUTPUT 12.0, high-speed cooling for less downtime in high-demand applications, 35-minute supercharge to 80%, and the longest life vs REDLITHIUM batteries. REDLITHIUM FORGE are Milwaukee's most powerful, fastest charging, and longest-life batteries. The M18 REDLITHIUM FORGE HD12.0 delivers 12 amp hours of runtime with 50% more power than the HIGH OUTPUT 12.0, providing optimal power and runtime for demanding applications. The M18 REDLITHIUM FORGE HD12.0 is COOL-CYCLE capable. COOL-CYCLE Active Cooling System provides high-speed cooling for less downtime. Patented ingress coating provides increased protection to maximize active cooling through an upgraded venting design. The high-speed cooling feature works with M18 chargers that have COOL-CYCLE capability. When paired with the  M18 Dual Bay Simultaneous Super Charger, this battery charges in just 35 minutes to 80%, getting you back to work faster than ever before. 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. Fully compatible with 250+ M18 solutions.