Clever Altoids-Tin-Chargers abound, but many feature complex builds. This DIY charger feature a simple schematic more suited for beginners.
Powered by a 9v battery this Altoids Tin hack is suitable for both regular USB devices and iPhone/iPods (as the design includes power on the extra USB lines that Apple devices require). Watch the above video to see it in action and then hit up the link below for the whole step-by-step guide at Instructables.com.
Make a USB iPhone/iPod Charger on the Cheap [Instructables]