What should I do if the lithium battery cannot be charged after being stored for a long time?

With the widespread use of smart devices, lithium batteries have become an essential part of our lives. However, sometimes we encounter issues when trying to charge a lithium battery that has been unused for an extended period. These issues may include the battery not charging or charging very slowly. This happens because prolonged inactivity can cause chemical reactions inside the battery, leading to severe battery polarization or electrolyte inactivation, which in turn affects the charging process. Although this problem is quite common, it can be resolved with some simple methods.

Firstly, if a lithium battery has been unused for a long time, we can try deep charging it. Deep charging involves charging the battery to its full 100% capacity and then discharging it completely. This cycle helps to remove the chemical reaction byproducts inside the battery and restore its performance. However, it is crucial to ensure the battery is not overheated before deep charging to prevent any damage.

Secondly, if deep charging does not resolve the issue, we can try placing the lithium battery in the refrigerator for a period. Refrigeration can slow down the chemical reaction rate inside the battery, providing a certain degree of repair. The refrigeration time should be controlled to avoid excessive damage; typically, 6-8 hours is sufficient. Additionally, care should be taken to prevent the battery from becoming damp or coming into contact with other metal objects to avoid short circuits.

Thirdly, if the above methods fail to solve the charging problem, we can attempt to activate the lithium battery. Activation involves using special techniques to stimulate the chemical reactions within the battery, restoring its normal charging capacity. A common activation method is to connect the battery to a power supply slightly higher than its rated voltage and maintain this for a period before charging it. It is important to ensure that the battery's temperature does not become too high during the activation process to avoid overheating or damage.

It is important to follow basic safety procedures when addressing lithium battery charging issues. Firstly, avoid using batteries that are overheated or damaged, as this could lead to safety hazards. Secondly, steer clear of operating near unidentified sources of fire to prevent potential fires. Additionally, when employing methods like activation, it is essential to carefully read the battery manual or consult a professional to ensure correct operation.

In conclusion, if a lithium battery fails to charge after prolonged storage, we can attempt to remedy the situation through deep charging, cold storage, or activation. These methods can help eliminate chemical reaction byproducts within the battery, restoring its normal functionality. Always prioritize safety during operation and adhere to relevant instructions. By following these simple steps, we can effectively resolve lithium battery charging issues, ensuring our smart devices continue to function efficiently.