The detecting machine is connected to the LED indicating box, and the LED indicating box is connected to the notebook battery to be tested through the test connector, and the test connector comprises a common connector female head and a PCB board with plugs at both ends, and the connector female head respectively Including battery positive, charge and discharge positive, battery negative, charge and discharge negative, clock signal, data signal, identification resistance, system ground test pin, test pin sequence fixed, one end of PCB board is connected with common connector female, the other end and laptop battery connection. The test leads that need to be replaced frequently are fixed to the device in a certain defined order, and the replacement of the entire line is replaced by the replacement of the circuit board.