Usually doesn't damage the car.
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The use of car charger has nothing to do with battery damage. A battery is a battery, and it has its own lifespan, just like your cell phone battery.
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Car chargers generally do not damage the car. Note that it must be used when the engine is working, and the battery is charged by the generator.
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Then the battery is connected to the car charger, otherwise the battery will run out of power.
For the car battery is just fur, as long as the normal use of car charger, basically there will be no damage.
1, do not insert the car charger before the vehicle engine starts, otherwise the voltage at the start may hurt the phone. 2, remember to unplug the car after the vehicle is turned off, although many vehicles are now pulling the cigarette lighter.
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It does not hurt the car but it hurts the mobile phone, after all, the power is unstable.