This is a portable usb charger made for a car charger and an Altoids tin .
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Step 1: Parts
You will need an Altoids tin, USB car charger, 9 volt battery and clip ,and a small toggle switch
Step 2: Soldering
Solder the negative wire of the battery clip to the negative terminal of the car charger. Solder the positive wire to one side of the toggle switch then solder a wire to the other switch terminal and the other end of the wire to the positive terminal of the car charger
Step 3: Drilling
Drill a hole for the switch and the usb
Step 4: Assembling
Put the parts in the Altoids tin