Dynacore Charger D-4BMC can charge 4x B-mount batteries simultaneously at 33.6V/3A, 100W per channel super fast charging speed, save up to 60% charging time comparing to normal chargers. To charge 4x 290Wh B-mount batteries, the D-4BMC will take only 2 hours 30 minutes to charge to 80%, and take 3 hours 50 minutes to fully charge.