I don't think their box mod counts as a passthrough. It has to be plugged into a wall, not usb. However, it will output 1.3v-11.5v. Let me know if this isn't the one you were speaking of: http://www.dfwvapor.com/110-box-mod.html
yeah seems like I am always either at the computer or driving long distances, so I am looking at that to help save on batteries. As with a couple of adapters you can plug it into a power strip/wall plug or the cig lighter in the car.
I have two of those ringo. They are pretty nice and have a puff counter. The problem I have is I only get about 4-6 hours per battery life. I'm not around any USB outlets during the day so I only use them if I'm going on a short trip. They are very cool though!
Edit: I got them from happyesmoker.com for only $30!
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