A car charger is a device that plugs into the 12V cigarette lighter outlet inside a vehicle, then connects to an electronic device such as cell phones, MP3 player or ipad to charge their battery.
For charging a cell phone by car charger, you can use a power cord connect cell phone car charger USB port. And we suggest not to use car charging for charging your cell phone when you are in a call. The best way is charging your cell phones fully before using it.
There is also a kind of car charger for charging laptops.