Why is my car charger draining my phone battery?

Why is my car charger draining my phone battery? Though it doesn’t seem like it requires much electricity to charge, phone chargers actually can drain your battery over time. The reason why is that the USB ports in vehicles are often over-powered in comparison to the voltage that the phone would receive out of a regular wall outlet at home.

Though it doesn’t seem like it requires much electricity to charge, phone chargers actually can drain your battery over time. The reason why is that the USB ports in vehicles are often over-powered in comparison to the voltage that the phone would receive out of a regular wall outlet at home.