Fantastic. You people just gave me a reason to buy ANOTHER accessory. Appreciate that.
You didn't already have some kind of USB charge port in your car? Tsk tsk. My favorite now is the one I have for my cellphone. Well any microUSB of course, but I digress ... on the part that plugs into the 12v port, it also has a USB power port. So I can be charging phone and a battery at the same time.