In our daily life, the 18650 lithium battery cannot be charged. What is going on? What should we do if we encounter 18650 suddenly not charging? It’s okay, don’t be nervous, let’s take a look at the 18650 today. Why can’t the lithium battery be charged? What should I do.

18650 lithium battery

Check whether the 18650 lithium battery is really unchargeable

1. First, eliminate the problem of the charger, use a multimeter to test whether the output of the charger is around 4.2V, or compare it by changing the battery to see if the charger is working properly, or you can change it to a charger;

2. Use a multimeter to test the battery, assuming that the voltage is zero and the resistance is zero, it may be that the battery is broken, and the battery must be repurchased;

3. If you use a multimeter to test that the battery still has a voltage of 0.2V or higher, then the battery still hopes to be activated and can be used normally. It is best for laymen to ask professional and technical personnel to check the activation;

3. There is a possibility of improper use of the 18650 lithium-ion battery pack. Usually, the battery is over-discharged due to the failure of the over-discharge protection of the battery’s internal insulation board, and the battery is in a state of suspended animation;

4. The battery electrode contacts are dirty, and the contact resistance is too large, resulting in excessive voltage drop. When charging, the host considers it is fully charged and stops charging.

What should I do if the lithium battery cannot be charged?

A minimum limit is set for the discharge of lithium batteries. This is the reason why the irreversible reaction caused by over-discharging the battery, that is, our battery is left for too long to be charged. Therefore, sometimes you can use the “activation” method to try it out.

Generally, lithium batteries are charged with a “constant current-constant voltage” method, that is, first charge with a standard current for a period of time, and then charge with a constant voltage when the battery voltage reaches the charge cut-off voltage. Therefore, you can use the DC power supply to charge for a period of time, and wait until the cut-off voltage is reached before using the original charger. Although this method is sometimes feasible, it is not impossible. After all, excessive battery discharge has affected the battery performance, but there are also A phenomenon in which batteries that have been left for several years will be activated.

How to maintain the lithium battery?

lithium ion battery maintenance

1. Due to the self-discharge phenomenon of lithium battery, if the battery is not used, if it is to be stored well for a long time, the battery voltage should not be lower than its cut-off voltage, preferably between 3.8~4.0V;

2. It is recommended to charge the lithium battery once for half a year, and the battery has been kept above the cut-off voltage;lithium-ion battery first charge myth

3. The temperature and humidity of the battery storage environment are appropriate and should be operated in accordance with the instructions;

4. It is best not to combine old and new batteries, batteries of different brands, capacities and models, or mix and match them into battery packs.

5.Beofre Assembling the battery cells,you need to know the life span for the battery cells