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• Why can't the 18650 battery be charged after running out of power?

First of all, the emergence of China's power exhaustion can not be recharged is actually a case of over-discharge of battery management.

The 18650 battery was a lithium-ion battery. The ordinary battery is 18650 with a rated voltage of 3.7V. 18650 pack builder It has a storage range of about 2.5V to 4.2V, which means that when the battery is fully charged, it will be 4.2V, and when it is discharged, it will be without a power source of about 2.5V.

In the general design of the lithium battery charger, battery manufacturing machine in order to play a role in safety protection, when the battery is put into the charging tank, there will be a differential process at the beginning, that is, whether the battery charged through the voltage difference is a lithium battery. The general rule is that if the battery voltage is lower than 2.0V, it will not be considered a lithium battery, so the charger will not charge the battery, which can simply avoid user misoperation (such as dry battery or nickel-hydrogen-nickel-cadmium battery), resulting in safety accidents.

All of the above features are simple and practical. li ion battery construction Early or simple chargers will add this feature. The disadvantage is that when the voltage is 0 volts, or the lithium-ion battery that has been unused for a long time is discharged below 2.0 volts in the air, the charger cannot charge the battery through the protection panel.

Of course, the 18650 power exhaustion can not be charged (overdischarge) situation can actually be solved. For hands-on technicians, activating the protected battery is not difficult. It can also be solved manually, find a battery with voltage, positive to positive, negative to negative. However, this method only works with protected batteries. If used in overdischarged batteries, it may directly damage the battery due to excessive shock current.

For the public through user management, now we also have their own lithium battery charger that can be activated as 18650 on the market. That includes XTAR Axstar. XTAR's charger is added to the student program with a business identification and processing system. When the charger finds that the working voltage capacity of the battery put into the problem is less than 2.0V, the charger will still use such a small impact of the current to learn the battery technology to charge, this process of current control design is very small, will not damage the dry battery or nickel-hydrogen-nickel-cadmium battery or safety accidents. Due to the different cultural characteristics of Chinese batteries, under small current loading, the development of dry batteries or nickel-hydrogen-nickel-cadmium batteries will not increase voltage or only slightly, but the storage range of lithium batteries is 2.5V to 4.2V, so the voltage increase is very fast. Then according to the charger with a history of a very short time after the difference again, if not boost the identification of dry batteries or nickel-hydrogen-nickel-cadmium batteries, stop charging; If the economy is rapid boost, that is, the lithium battery, continue the education activation until it gets back to normal operation analysis and then switch to constant current charging. Thus achieving the over-released 18650 resurrection.