I’m confused by this whole thing. Yes, its interesting that this is possible, but at the same time it just seems like a whole lot of hassle to produce something that you can buy relatively cheaply off the internet.
Here someone shows you how to make a portable charger which may or may not melt your device depending on just how good you are with a soldering iron..
https://www.youtube.com/watch?v=7MetOowqLNQ
Full details on all the bits you’ll need are available on this BuzzFeed article. Get a soldering iron, a 9v battery, a tin, some tape and… oh, just go and buy a portable charger instead eh ? 🙂