What is the reason that the 18650 lithium-ion battery cannot be charged?

Reasons for 18650 Li-ion battery charging failure 1. The internal charging circuit is faulty and cannot be charged normally. 2. There is an internal failure of the 18650 lithium-ion battery. 3. The battery electrode is dirty and the contact resistance is too large, causing the voltage drop to be too large. When charging, the host is considered to be full and stop charging; the 18650 battery cannot be charged. Solutions: 1. The charger interface is aging or the charger itself is damaged. Replace with a new charger for testing. 2. There is a problem with the quality of the charging line. Replace with new pipeline. 3. The metal in the charge hole is oxidized to cause poor contact, which is a hardware failure, and detailed maintenance should be carried out after the sale. The battery itself is exhausted or damaged, directly replace the battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet, if there is any infringement, please contact to delete.