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How to make a portable and rechargeable usb charger
Clear all the mints and paper out of the altoids tin (mints can be put in a plastic bag so they can still be eaten.
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Find a female usb port.
These ports can frequently be found on usb extension cords.
If using a usb extension cord, cut the wire as far away from the part in which you plug in the wire you wish to extend. Strip the wires find the black (-) and red (+) wires.