... start-up power supply and complementary charge power supply such as car or generator etc. ( YK-CD122440 ) aaa rechargeable batteries, ... process is “(preset) constant current→(reach to equal charge constant voltage value)constant voltage reduce current→(automatic switch) ... 60hz inputCharge current 5A,8A,11A,15A,19A,23A,27,31A,35A,40A charging current optional Charge processConstant current—(constant ...