This 5V 10A/20A capacity grading machine is used to test the capacity of cylindrical batteries through cyclic charging and discharging tests. The whole machine has 256 channels and can test 256 cells simultaneously. It adopts double tray design, which can be used for testing cylindrical batteries with a diameter range of 18-32 mm and length range of 65-140 mm. The voltage & current accuracy up to 0.5‰ and has energy-saving feedback function.