The Milwaukee M18 Dual Bay Simultaneous Rapid Charger is capable of allowing users to charge 2 batteries at the same time, over 3X faster than standard sequential chargers. Equipped with REDLINK Intelligence, this battery charger communicates directly with all M18 batteries to monitor cell voltage, temperature and charge status to deliver the best combination of charge duration and battery lifespan. Charging batteries simultaneously at a Rapid Charge rate massively reduces downtime and maximizes productivity. The M18 Dual Bay Simultaneous Rapid Charger is perfect for professional users who charge and swap battery packs throughout the day. M18 REDLITHIUM HIGH OUTPUT HD12.0 Battery Pack provides 50% more power and runs 50% cooler vs M18 REDLITHIUM HD battery packs. The massive increase in power elevates the performance of the entire M18 system and drives the next breakthrough in M18 FUEL, delivering the power of 15 Amp corded product. It delivers fade free power and runs substantially cooler through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever before.