Our M18? Dual Bay Simultaneous Rapid Charger is capable of charging two batteries at once, over 3X faster than standard sequential chargers. The charger accepts all MILWAUKEE? M18? batteries. This compact battery charger is equipped with REDLINK? Intelligence that communicates directly with M18? batteries to monitor cell voltage, temperature and charge status to deliver the best combination of charge duration and pack lifespan. Charging batteries simultaneously at a rapid charge rate massively reduces downtime and maximizes productivity. Its compact size makes 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. Our M18? Dual Bay Simultaneous Rapid Charger is perfect for professionals who charge and swap battery packs throughout the day.