The battery-powered USB charger isn't an altogether new idea. ... Try making one yourself with a little help from a 9V battery and a few . Sure you could go buy a USB charger off the shelf, ...

DIY 9V Battery USB Charger 7:29 am November 4, 2009 By Julian Horsey If you’re looking for a neat DIY project this weekend, then this DIY 9V Battery USB charger could be a fun gadget to create.