You can follow the following steps to solve the problem:
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1. The charger itself is damaged. Although the indicator light is on, the output voltage of the charger is not, or the plug or wire is disconnected, so the battery cannot be charged. If the battery cannot be charged, the motor cannot be started; Otherwise, the motor cannot be started.
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2. When the charging socket of the small fan is faulty and open, the battery can not be charged;
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3. Due to long-term charging and discharging, rechargeable batteries have poor performance and lose charging ability