[header] How to make a portable and rechargeable usb charger [title] 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. [step] ) [title] Find a female usb port. [step] These ports can frequently be found on usb extension cords. 
[title] 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. [step] Strip the wires find the black (-) and red (+) wires.