M18 Dual Bay Simultaneous Super ChargerM18 Dual Bay Simultaneous Super Charger high speed cooling for less downtime in high demand applications, 35 minute supercharge to 80 percent, and the longest life vs Redlithium batteries. Redlithium forge are Milwaukee's most powerful, fastest charging, and longest life batteries. The M18 Redlithium Forge HD 12. 0 delivers 12 amp hours of runtime with 50 percent more power than the high output 12. 0, providing optimal power and runtime for demanding