5v USB to 9v battery case

Revision: Made changes to the lid to make it easier to open.

This is a 5v to 9v battery case and charger housing designed to turn a normal car charger into a portable battery charger that accepts standard 9v batteries.

Its based on this youtube video: https://www.youtube.com/watch?v=Akqcos28R-0

You will need:
- 1x 9V battery
- 1x cigarette-plug-style car charger such as this: https://www.walmart.com/ip/INSTEN-Universal-USB-Mini-Car-Charger-Adapter-White-For-LG-Nexus-4-5-Samsung-Galaxy