12v Powerbank - USB to 12v

You only need 3 simple things

- A boost converter (This is the cheapest with voltmeter, the same i use)

http://www.ebay.com/itm/DC-DC-4-5-32V-to-5V-52V-XL...

- A USB Cable

- And is optional, but a estandar DC power plug is usefull

Then connect, adjust the output voltage to 12v and thats all :)

A lot of things works on 12v, and now you have a battery for all of them.

Look a example of how many things you can use it on the right of this image.