Yosoo 4 Ports Multi Parallel 4 Rapid Batteries Charging Charger Board Plate For YUNEEC Q500 RC Quadcopter Drone Support 4 batteries charge at same time Support Original charger and B6 charger adapter For protecting battery, suggest the current do not exceed 5A To fully charge a battery will take about 50 minutes while the output is 4A 2 batteries will take about 85 minutes, 4 batteries will take about 200 minutes