First, the charger is faulty, causing it to show a red light
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If the electric car charger fails, it is generally manifested as internal components falling off or damaged, which will lead to the charger can not normally jump the light, or even can not charge, causing the charger to always show a red light. For such a case, you can only choose to replace the new charger, rather than repair, because the charger is more troublesome to repair, and it is easier to cause problems again resulting in overcharging of the battery. In addition, there is also a point to note that replacing the new charger needs to match the consistency of voltage and current.
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Second, the battery has a water loss fault, resulting in the charger has been showing a red light