1、 Check the appearance of the battery to see whether there is obvious deformation or bulge on both sides of the battery and whether there is white or green powder around.

2、 The observation port inspection shows that more than 80% of the batteries will have an observation port, which is usually directly above the battery. The colors that can be seen at the observation port are divided into three kinds: green, yellow and black. Green represents sufficient power, yellow represents slight power loss, and black represents that the express is scrapped and needs to be replaced.

3、 Battery voltage detection: the voltage of automobile battery is generally about 12V. After the vehicle is started, it will rise to 13-14v. These are normal voltage values. Usually, we can measure the voltage of battery through voltage measuring instrument or multimeter, and we can also observe the voltage. If the voltage before the vehicle is not started is lower than 12V or the voltage after the vehicle is started is lower than 13V, it indicates that there is more loss of the battery. Judging the condition of the battery from the voltage value of the battery is still a better method.