7 February 2013, 22:24
Halfords do one that's cylindrical. Has a lead with a 12 v plug on, and two 12 v sockets plus 2 Usb sockets. Got one for my son for Christmas. It's designed to fit in the cup holder. Tjhere are loads of cheap usb car chargers around. They do have a voltage regulator of some kind in them to step down from 12 v to the 5 v required by usb.
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