The following reasons may cause the fan to fail to be charged:
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1. Charger problem: The charger has a problem, can not provide enough power to charge the fan, you can try to replace the appropriate charger.
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2. Battery problem: The battery used by the fan may be aging and damaged, resulting in failure to charge or greatly reduced capacity, you can try to replace the battery.
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3. Charging port problem: The charging port of the fan may be abnormal and cannot be connected to the charger for charging. Check whether the connection is clean or has impurities.
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4. Charging method problem: Some fans may need to be charged in the correct way, such as turning off or on the fan, and different types of fans may have different charging methods.
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In short, you first need to determine whether the charger and battery are normal, and then check whether the charging interface is normal, and whether it is charged in accordance with the correct charging method.