Powerisite – convet dewalt batteries to USB

I have to say this is a pretty good idea, basically the author has a kickstarter project where for around $12 you can get an adapter that would convert your dewalt battery into a USB charger.  Thus making the batteries even more useful.  Too bad most of my tools are ryobi based.  Thought it would not be too hard to do with with a ryobi battery and convert a car 12 volt to USB charger.

http://gizmodo.com/charge-your-phone-from-your-power-tools-with-this-handy-1469809905?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+gizmodo%2Ffull+%28Gizmodo%29