Replace the battery. The cause of the problem you mentioned is the battery problem, and the internal lithium battery is seriously damaged by aging. The charging small electric fan can be turned by plugging in the power supply, which indicates that there is no problem with the motor part of the electric fan, and there is no problem with the charging circuit conversion.
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If it is not plugged into the power supply, it does not turn, that the battery has no output current, one case is the battery open circuit, the other most likely case is that the battery is seriously aging and can not save electricity.
Indicates that there is a problem with the charging system, or the battery is damaged, open to repair it!
The rechargeable battery is broken, or it can't be charged.