This is a USB charger that can be charged by a 9V battery.
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Step 1: Material
what you will need for this project is a car charging port, a 9 volt battery, and a paperclip.
Step 2: Step 1
First connect the port to the smaller end of the 9 volt battery.
Step 3: Step 2
Next loop the paperclip through the metal clip sticking out of the side of the port, and then connect it to the other part of the battery.
Step 4: Final
You can use a binderclip or electrical tape to connect the battery to the car charging port.