This is a guest post written by Morandir835, a regular on V4L’s sub forum on ECF, and an e-cig enthusiast.
One e-cig piece I haven’t explained yet is the passthrough, known by many as a “PT.” It’s not really a battery, but can be a life saver when driving or when all of your batts are charging. It comes in both auto and manual versions, but requires an external power source to run, namely a USB port. Unlike batteries that start at 4.1 volts depending on the model, PTs run at 5 volts constantly. That is as long as they are hooked up to a proper power source. This is where the wall and car adapters come into play.