The SIMA seems to be your best option, unless you already have the creative car charger.
http://taperssection.com/index.php?topic=38106.0
That appears to be AC.
I thought I made it pretty clear in the Subject header
It DOES
AC or DC voltage conversion . Hense why i liked it better than the wally world version(initial) as this way you dont need to hack anything to get it work for either. And it comes straight out of the box ready to roll. No need to check for polarity On the JB3 tip end as it only fits One way , they Way your need it (tip +)
Many folks have tried to use 7volt batts to do this, which does not appear to work, As the Sima or Initial Voltage box wants a higher voltage for it to convert .
As I stated in the thread I have used nothing but 9v & 12v batterys Including 12volt SLA and 9volt Lithiums . I have ran Multiple test using both and have never had a problem.
Again I state , "I tested this ALOT before I posted to this list as I wanted to make sure it was almost fool proof before I had folks frying there Jb3 or something stupid."
If you follow the directions in the thread
it will work .
Nick