In general, a car charger is designed to provide power to your mobile devices without draining the car’s battery. However, it is important to note that leaving a car charger plugged in for an extended period of time can potentially drain your car battery. This is because car chargers draw power from the car’s electrical system, even when your phone or other devices are not connected or charging.
To prevent your car battery from draining, it is recommended to unplug your car charger when you are not using it, or when the car is turned off. It is also a good idea to ensure that your car battery is in good condition and fully charged before using a car charger. If you notice that your car battery is consistently losing charge or having trouble starting, it may be time to have it checked by a professional.