The charger is overloaded, the current is too large to fuse the insurance. Reason analysis:
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1, the charger output short circuit.
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2, the battery reverse connection, need to confirm whether the battery polarity and voltage match.
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3, the charging end of the load increased, please check that there is no additional load or local short circuit. Check it's all right. Put it on and it'll charge.
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4, the charger is damaged, in this case, the insurance will continue to burn.