Theo Markettos wrote:

Andy Burns wrote:

Elechi Amadi wrote:

I can't find a 5.3 volt adapter for the car.

You don't want one

It'll be fine.
The USB spec goes up to 5.25V. The extra 50mV won't fry anything.

The nominal 5.3V is already out of spec, who knows what the tolerance is
on it, +/- 5% perhaps, so now it could be 300mV over, then someone
charges an unprotected e-cigarette from it and ...

http://google.co.uk/search?q=usb+cigarette+fire