1. Check whether the charging interface is loose. Since the vehicle is usually shaken during driving, it may be that the charging interface is shaken and loosened, resulting in no access to the power supply and no charging;
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two
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Check whether the electrical equipment needs high power input to work normally, it may be that the output power of the car charger can not meet the requirements of the electrical equipment, resulting in a long time to charge the power is not up;
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three
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Sometimes the output of the car charger is not stable enough, and most electronic products have a self-protection mechanism to avoid the high and low current to destroy the device itself, so it will not be charged.