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. Its compact size and integrated hang holes make this an ideal charger to carry on and off the job, hang in a work trailer or charge on the top shelf of a job box.