1, the charger itself is damaged, although the indicator light will be on, but the output voltage of the charger is not or the plug, line short circuit and other conditions lead to the battery can not be charged.
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2, the charging port of the small fan is faulty or the circuit is short, which will also cause the small electric fan to be unable to charge.
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3, when charging the small fan, long-term charging and discharging will lead to poor performance of the small fan and lose the ability to charge.
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4. The internal parts of small wind power are damaged, resulting in inability to charge
It means that there is a problem with your charger or battery, take it to love to repair it