Possible causes and solutions for 18650 lithium battery cannot be charged

Possible causes and solutions for 18650 lithium battery cannot be charged

There are several possible reasons why the 18650 

lithium battery cannot be charged:

Poor battery connection: 

If the contact between the battery and the charger is poor, the battery cannot be charged. At this time, you need to check 

whether the contact between the battery and the charger plug is good, or replace the charger and the battery.

Incorrect battery polarity: 

If the battery is reversely installed into the charger, it will also cause the battery to be unable to charge. The correct operation 

is to connect the positive terminal of the battery to the positive terminal of the charger, and the negative terminal of the battery 

to the negative terminal of the charger.

Battery failure: 

If the charger itself fails, it will also cause the battery to be unable to charge. The charger needs to be replaced to solve the problem.

Battery aging: 

If the battery has been used for a long time, the battery capacity may have been reduced, and the battery internal resistance may be 

increased, which will cause the battery to be unable to be fully charged. In this case, you need to replace the battery.

Insufficient charging voltage: 

If the charger output voltage is insufficient, it will also cause the battery to not be fully charged. In this case, check whether the output 

voltage of the charger meets the requirements of the battery.

In short, if the 18650 lithium battery is not charged, it is necessary to check the battery connection, polarity, charger, battery aging and 

other factors to find the problem and repair or replace the device.