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@tricitybendix
The CTC forum has a lot of stuff on this including some frankly baffling homemade efforts from electrical engineers.
If you have usb chargeable stuff and you're going abroad I recommend this (or similar): http://www.maplin.co.uk/high-power-usb-charger-with-travel-adaptors-513509 - was massively useful for the trip I've just been on.