First, because today's smart phones basically support USB charging, the car charger only needs to have a USB port.
That's the basic premise.
Second, is the size of the current of the USB port, too large or too small is not good, will affect the charging efficiency, serious damage to charging
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The charging current of the iPhone can be between 1A and 2A, if you want to charge the IPAD, choose a car with 2A output
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Apple has charging protection, there may be a case of not rushing in, such as prompting what is not certified. Even if there is...
Charging protection, but also try to use voltage and current stable charging head and line to charge, extend the use of equipment time.