I was dead set on getting the regular joyetech eVic VT device until I saw the starter kits for the mini. The only thing is, I'm reading that the mini uses an external battery (18650) yet has passthrough capabilities. Maybe I'm completely behind the curve, but is this true? I didn't know this was possible if the battery is removeable. I can't find much more info on it and most sites seem to say nothing of it. I just want to make sure I can use it while charging as that's a big selling point for me. Anyone have personal experience with these devices?