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If the charger is not broken, it may be that the plug is not plugged in, or the battery interface of the balance car is loose, resulting in no connection, so it is still green, which is equivalent to not charging. I suggest you go to the balance car repair shop.
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Normal battery cycles 500~1000 times. After the ambient temperature drops to 5°, its discharge capacity will decrease, including when charging, it will also have certain requirements for temperature