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The 18650 lithium battery is a commonly used lithium battery in electronic products, often used as a battery cell in laptop batteries. We have found that sometimes 18650 lithium batteries cannot be charged during use. Let's analyze the reasons below.

1. The electrode contacts of the battery are dirty, and the contact resistance is too high, causing a large voltage drop. When charging, the host thinks it is fully charged and stops charging;

2. Internal charging circuit malfunction, unable to charge normally;

Internal malfunction of 3.18650 lithium battery.

18650 battery cannot be charged into electrolysis solution

1. If the charger interface is aging or the charger itself is damaged, replace it with a new charger for testing.

2. The metal in the charging hole is oxidized and causes poor contact, which is a hardware malfunction. It is necessary to contact after-sales for detailed inspection and repair.

3. There is an issue with the quality of the charging cable, please replace it with a new one.

4. The battery itself has reached its end of life or is damaged. Simply replace the battery.

18650 Lithium Battery Repair Principle

Repair principle one: The metal surface of a lithium-ion battery that has been used for a long time will have a certain degree of oxidation, causing poor contact between the phone battery and the phone. The lithium-ion battery has a shorter usage time, and using a rubber eraser or other cleaning tools can remove the rust on the surface, making the contact between the battery and the phone better.

Repair principle two: Low temperature can cause changes in the electrolyte inside the lithium battery, promoting chemical reactions in the newly frozen battery. The use of lithium batteries is actually a process of charging and discharging. During this period, the negative and positive charges inside the battery collide with each other. The reason why batteries are becoming increasingly unusable is that at normal room temperature, the kinetic energy inside electrons is relatively large, so the battery is in an active state and leakage is relatively frequent. When a lithium battery is placed in a low-temperature environment, the microstructure of the lithium film and electrolyte on the surface of the battery, as well as their interface, will undergo significant changes, resulting in temporary inactivity inside the battery and reduced leakage current. So after recharging, the battery life of the phone will increase.

The cyclic service life of lithium batteries is about 600 times. If the number of charges is increased, the thermal motion of the molecules will gradually destroy the microstructure of their internal molecular arrangement, and the efficiency of charge storage will gradually decrease. The freezing process can easily damage the original internal structure of the battery, which may increase its ability to charge in the short term, but long-term use may not be effective. Once the microstructure inside a lithium battery is damaged, it is impossible to fully recover, and long-term use of this method will accelerate the loss of the phone battery.

Repair principle three: Deep discharge of the phone is achieved by depleting internal energy to achieve deeper recharging, which requires some unconventional methods. Find a way to connect the phone to a 1.5V small light bulb, and the internal power of the lithium battery will be transferred to the small light bulb until it is fully discharged. A mobile phone needs to slowly drain its power through a lower voltage. Under normal circumstances, if the rated voltage of the phone is below 3.6 volts after being connected, it will automatically shut down. After discharging, a recharged phone battery can be used for a longer period of time.

Repair methods for 18650 lithium batteries

1. After using up all your batteries, take them off and use temperature treatment. When the temperature is unstable, the battery will greatly shorten its usage time because the battery is not charged and a considerable number of lithium ions already carry memory electricity. This method can release some of the memory electricity. When winter comes, leave it outside for a while, and then go inside.

2. Another method is to remove the battery, let it sit for about a week, and slowly consume the electricity. You need to use a machine to fully consume the electricity first. Then fully charge it again. It is estimated that your current charging time is very short. After fully charging, disconnect and charge again. Repeat this process a few times, and it will definitely be effective.

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