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Hello, so I am working on my bachelors in network security and I have started messing around with electronics as a hobby. I was looking online for anyone that has added a usb port to the Pineapple Juice 1800, and could not find anything so I decided to give it a try myself. The little board with the usb port is from one of those car usb adapters that plugs into the cig lighter. I bought it for 99 cents with free shipping off ebay a while back. It takes 12v from the vehicle and converts it into 5v for usb, so I figured it would work just fine with this battery pack. The first thing I did was take off the led that was on the board since there is already one on the PJ1800. I then soldered (very poorly) the positive and ground wires to the appropriate connectors on the board. I used a multi-meter to figure out which terminals to solder the wires from the usb board to. I crammed everything in the box. There is not a lot of room so the usb port sticks out from the case. It’s not very pretty, but it works.