How to judge whether a battery is good or bad?

Batteries are common power sources and are used in various electronic devices. The quality of the battery directly affects the life and performance of the equipment. Therefore, before using the battery, it is necessary to inspect the battery to determine whether the battery is good or bad.

Except for open circuit, short circuit and broken cell slot, it is impossible to judge the quality of a battery by its appearance. It is necessary to conduct a discharge test to determine whether the battery is good or bad.

Discharge test method

There are many methods for discharge test, and the commonly used methods are constant current discharge test and constant power discharge test.

• Constant current discharge test

The constant current discharge test refers to discharging the battery at a constant current and recording the voltage and time of the battery. According to the voltage and time curve of the battery, the capacity, internal resistance and other parameters of the battery can be calculated.

• Constant power discharge test

The constant power discharge test refers to discharging the battery at a constant power and recording the voltage and time of the battery. According to the voltage and time curve of the battery, the capacity, internal resistance and other parameters of the battery can be calculated.

Precautions for discharge test

When conducting a discharge test, the following precautions should be taken:

• The discharge current or power should be selected properly to avoid damaging the battery.

• During the discharge process, pay attention to monitoring the voltage of the battery to avoid over-discharging the battery.

• After the discharge test is over, the battery should be charged in time.