1. The battery is damaged. Such as plate fracture, falling off, or serious \"vulcanization\" of the plate will appear in this phenomenon.
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2, the electric car charger is faulty. If the isolation diode used for output voltage is broken, it will not be charged.
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3. The plug of the charger connected to the battery is in poor contact. Because the plug is often inserted and removed, and because the current at the plug is large, it is easy to heat, and the contact is not good, which is also a common fault.
The reason may be that the charger plug is in poor contact and must be pulled new