The detector is connected to the LED indicator box, which is connected to the notebook battery to be tested through the test connector. The test connector includes a common connector female head and a PCB board with plugs at both ends, and the connector female heads are respectively Including battery positive electrode, charge and discharge positive electrode, battery negative electrode, charge and discharge negative electrode, clock signal, data signal, identification resistance, system ground test pin, the test pin sequence is fixed, one end of the PCB board is connected to the female connector of the common connector, and the other end is connected to the laptop battery connection. Fix the test wires that need frequent replacement on the equipment in a certain defined sequence, and replace the entire wire with the replacement of the circuit board.