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If you spend a lot of time in your car -- like I do -- you need a way to keep your portable devices charged up while you're on the move. While chargers for smartphones such as the iPhone are plentiful, good chargers that output the 2.1A needed by tablets such as the iPad are harder to find.
Currently I'm using a dual USB-port Just Mobile Highway Pro that keeps my iPhone and iPad charged up. It's a little pricey at $40, but it's one of the most reliable charger I've come across so far.
Image source: Just Highway.