How to detect the loss of 18650 lithium-ion battery pack batteries

1. Battery consumption performance: the battery voltage does not go up and the capacity decreases. Measure directly with a voltmeter, if the voltage across the 18650 battery is lower than 2.7V or there is no voltage. Indicates that the battery or battery pack is damaged. The normal voltage is 3.0V～4.2V (generally, the voltage of 3.0V battery will be cut off, and the voltage of 4.2V battery will be fully saturated, and some also have 4.35V). 2. If the battery voltage is lower than 2.7V, you can use a charger (4.2V) to charge the battery. After ten minutes, if the battery voltage rises, you can continue to charge until the charger prompts to be full, and then look at the full voltage. If the full battery voltage is 4.2V, it indicates that the battery is normal, it should be because the battery was cut off because of the excessive power consumption last time. If the full voltage is much lower than 4.2V, it means that the battery is damaged. If it is a battery that has been used for a long time, it can be judged that the battery life is up and the capacity is basically exhausted. Should be replaced. There is basically no way to fix it. After all, lithium-ion batteries have a life span, not infinite. 3. If the 18650 lithium ion battery pack is measured and the battery has no voltage, there are two situations at this time. One is that the battery is good, and it is caused by long-term loss of electricity. This kind of battery has a certain chance to recover. Generally, lithium ion batteries are used. Pulse activation meter (lithium ion battery charge and discharge meter) to charge the battery multiple times in a short time, it is possible to repair. Generally, the repair cost is not low, so you should buy a new one. Another possibility is that the battery is completely worn out, the battery diaphragm is broken down, and the positive and negative electrodes are short-circuited. There is no way to fix this kind of thing, only buy a new one. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How should I choose AGV car lithium-ion battery?