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1 will damage the battery.
2 Cigarette lighter charging is through the car battery to charge the device.
But the car battery is mainly used to provide power to the car's electrical system, not to charge other devices.
The cigarette lighter charging method will cause the car battery to be in a high load state for a long time, thus shortening the life of the battery and may even damage the battery.
3 If you need to charge the device, it is recommended to use another suitable charging device, such as a power bank or a charger specially equipped for the device, to avoid damaging the battery.