There are several reasons why it won't fill,
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Poor contact, blown fuse, battery scrap, circuit board open, battery positive and negative electrode problems. Electric vehicles need electricity, but if the circuit contact is poor, it will directly lead to the electric vehicle can not be charged.
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Check whether the contact between safety tube and safety seat, charger and power supply, plug and socket is normal. The fuse here refers to the fuse in the switch. If the fuse blows, there's no power. It's safer to take it directly to the repair shop at this time.
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In addition, most electric vehicles have a battery life of 3-5 years, and it is best to replace the battery every 3 years. But there are always some people who will scrap the battery early because of the improper charging method. Once the circuit board in the dial is disconnected, undercharging or no charging is normal.
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At this point, you just need to repair the circuit board. It should be noted that the reverse discharge of the positive and negative electrodes of the battery or the poor contact of the battery plug-in will directly lead to the charging state.