If the lithium battery loses power and cannot be recharged, it should be repaired by a professional repairer. The warranty period of lithium battery is three years. If it is a new lithium battery, generally the power loss is too great and can be restored after several repairs.
If the lithium battery cannot be charged if left for a long time, it can be repaired by charging it normally 3-5 times. If the charger is broken, you can replace it; if it is the battery itself, you can only replace it with a new one.
This is not necessarily a problem with the battery itself. It is very likely that there is a problem with the charger, charging socket and charging socket. You have to check first. If left for a long time, self-discharge will cause the battery to discharge. At that time, the capacity will be lower than normal, causing the battery to be too weak and unable to charge. But lithium batteries are easy to activate. After 3-5 normal charge and discharge cycles, the battery can be activated and restored to its normal capacity.
Precautions for using lithium batteries:
When using lithium batteries, it should be noted that the battery will enter a dormant state after being left for a period of time, and self-discharge will cause the battery power to be exhausted and the capacity is lower than the normal value at that time, which will make the battery power too weak and unable to charge. Due to the characteristics of lithium batteries themselves, lithium batteries have almost no memory effect. Therefore, the new lithium batteries in users' cell phones do not requires special methods or equipment during the activation process.
For low voltage charging, use a charger with a lower voltage than the original one. When the battery is charged to 20%, the voltage will return to the value, then replace it with the original charger. Single battery charging charges each individual battery in the battery pack, but note that the charger voltage must be consistent with that of the individual battery. This method takes a long time to restore the battery and recharge it.
Reference for the above content: Baidu Encyclopedia - Lithium Battery