Passthroughs and Wall Adapters

This is a guest post written by Morandir835, a regular on V4L’s sub forum on ECF, and an e-cig enthusiast.

Manual PT

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.

The standard output on a USB 2.0 port is 500 ma, and on a USB 3.0 port is 900 ma. There are ones that run higher, but it all depends on the motherboard manufacturer of your computer. The problem is running a PT with a WOW carto at 2.3 ohms will require 2.17 amps (2170 ma). That’s not only a strain on your motherboard, but also the 5 volt rail on your power supply. Although extremely rare, this can lead to burning out a USB port on your computer, to complete system failure. I suggest using a USB adapter, rather than your computer to run a PT. In order to run a PT properly you need a USB adapter that provides at least 5 volts/2 a output. Luckily, V4L sells both.

The V4L Car Adapter plugs into the cigarette lighter port of your car, and

Car Adapter

converts the 12 volt powered supplied into 5 volts. It’s rated for 2000 ma (2 a) but in all my tests actually provides up to 2.3 a of current. This gives you plenty of headroom for either WOW cartos or CoolCart cartos.

The V4L Wall Adapter is rated for 5.1 v/2/1 a and is built to UL standards. Just like the car adapter, it too provides higher than it’s rating. In the ones I’ve tested,

Slim USB Wall Adapter

they provide up to 2.4 a of current.

The PT has a few drawbacks to keep in mind. Because it requires an external power source, it is not portable. The higher voltage means you have a higher chance of burning a carto if it goes dry. A lot of people will suggest using CoolCarts for this very reason. Their higher ohms and slightly higher fill-capacity decreases your chance of burning a carto. Personally, I use WOW cartos on my PT (and everything else), but again personal preference will come into play like so many things with vaping. Still, there’s nothing quite like vaping at 5 volts.

Contact Morandir835 via e-mail at or through his page on ECF at

“Even Though I Nothing Learned, With Strength I Burned.” – Emperor

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