18650 battery does not charge.

The 18650 lithium battery is a very common type of lithium battery, and the battery cells for laptops are derived from 18650. We have found that sometimes 18650 lithium batteries cannot charge properly during use. Let's analyze the reasons below.

18650 lithium battery model
1. There are stains on the contact points of the battery. After contacting the charger, the resistance will increase and the voltage drop will be too large. The charger will assume that the battery is fully charged and stop charging.
2. The charging circuit inside the battery has malfunctioned and cannot be charged normally.
The 3.18650 battery itself has a problem.
How should the above problems be solved when 18650 occurs?
1. If the charger interface is aging or the charger has been damaged, it is necessary to replace it with a matching charger and test whether it can still be used.
2. The metal of the charging hole is oxidized, resulting in poor contact. This is a hardware problem and requires contacting the manufacturer or after-sales service for repair and testing.
3. The quality of the charging cable is problematic or not suitable for the battery, and a new suitable wire needs to be replaced.

4. The battery itself has reached the end of its lifespan or is damaged, simply replace the battery.

18650 lithium battery repair principle
Repair principle one: The metal surface of lithium batteries used for a long time will oxidize to a certain extent, causing poor contact between the phone battery and the phone, and shortening the use time of lithium batteries. Other cleaning tools can erase the rust on the surface, making the contact between the battery and the phone better.