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Lithium ion batteries can be divided into two categories, namely, lithium metal batteries and lithium ion batteries. The charging mode is basically CC/CV, which is also known as the conventional charging mode of lithium ion batteries. When lithium ion batteries fail to charge, there are no more than the following situations:

1) Li-ion battery cannot be charged due to over-discharge

That is to say, the lithium-ion battery discharge is very low, it is in a deep discharge state, and the power is basically exhausted, so that it is as low as the cut-off voltage of the lithium-ion battery. At this time, the activation method can be adopted, but it is not necessarily effective;

2) The charger or charging line is faulty

First of all, you should check whether the charger has any problems. The method is simple. You can directly measure the output voltage or connect the load of the corresponding voltage to observe. If there is a problem with the circuit, it will take some effort. After all, it involves circuit hardware and other problems. If necessary, you can directly disassemble it for analysis;

3) The lithium-ion battery has been used for a long time, and the battery fails

The possibility of this kind of situation is relatively small, but it cannot be ruled out. Your battery should be familiar with yourself, and it should be replaced after how long it takes;

4) There is a problem with the battery charging IC or BMS system

The battery management system has problems due to the imbalance of battery cells and other reasons, resulting in misjudgment of the management IC and the inability to detect voltage or current. Or if these chips fail to charge, generally speaking, it is necessary to replace a protection board with the same specification to confirm whether the fault exists on the protection board.

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