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How to repair polymer lithium-ion batteries

If the voltage of a lithium-ion battery is lower than 2.7V, you can use a charger to charge the battery. After ten minutes, if the battery voltage rises, you can continue to charge until the charger prompts full charge, and then check the full charge voltage. If the fully charged voltage is 4.2V, it indicates that the battery is normal. If the fully charged voltage is much lower than 4.2V, it indicates that the battery is damaged.

If the battery is measured and there is no voltage, there are two situations. One is that the battery was originally good and stored for a long time due to a lack of power. This type of battery has a certain chance of recovery, usually using a lithium-ion battery pulse activation device to charge the battery multiple times in a short period of time. The repair cost is not low, it's better to replace it with a new one; Another possibility is that the battery is completely depleted, the battery separator is broken, and there is a short circuit between the positive and negative poles. At this point, only new ones can be purchased.

The metal surface of lithium-ion batteries that have been used for a long time will have a certain degree of oxidation, leading to poor contact. Using a rubber eraser or other cleaning tools can remove the rust on the surface, which can slightly restore the lithium-ion battery.

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