Yosoo 4 Ports Rapid Battery Parallel Charging Charger Board for YUNEEC Q500 Quadcopter Rapid Multi-battery charger plate 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.