The charger that you choose should be one that you can use to recharge a range of devices whether it is your MP3 player, camera, iPod or mobile phone. Having a car charger that can accommodate all these different types of devices means that, you will not have to have multiple chargers cluttering in the car. Some car chargers also come with LED indicator, thus you can conclude that your mobile is being charged by car's battery. One end of the car charger, you need to insert in a lighter socket of the car and other end comes with a wire that you need to connect to your device you want to charge, that's all. Car charger comes with short circuit protection even it protects your mobile from overload. So it will definitely not provide any harm to the mobile phone's battery or car.
Sometimes you might have the need to recharge more than one device at a time. A car charger that can be used to recharge two or more devices at a time will be extremely beneficial. This feature would be very useful when you are travelling and would not be able to access a main power source for a long period. Of course, you should always make sure that the car charger fits in to the standard 12V cigarette lighter socket. Most car chargers should fit in to the standard cigarette lighter socket.