Never short on innovative ideas, the R&D team at SMOK have designed a revolutionary way to create what appears to be two new kits in one with just a little bit of magic and a sprinkle of engineering genius!

With size and weight being a prime consideration for some and others maximum battery life or cloud production, the guys have come up with a “smart” solution that they hope will solve all of the problems for you.

How? Simple. Include an extended battery door of course!

As the 2/4 in the name suggests, this device’s battery compartment or mission bays can easily be configured to hold two 18650 batteries or four, increasing the overall maximum output from 220W up to a breathtaking 350W.

Throw in a TFV8 Big Baby Tank with some low resistance coils and it’s another home run.

So, let’s jump in and take a look at the specs, performance and overall finish up close and personal!

The Package And What You Can Expect

1x GX2/4 MOD (Multiple Colour Choices Available)
1x Replacement GX2/4 Battery Cover
1x TFV8 Big Baby Tank (Capacity Standard: 5ml-EU: 2ml)
1x Replacement Glass Tube
1x V8 Baby Q2 (3.0T) 0.4Ω (pre-installed)
1x V8 Baby T8 (4.0T) 0.15Ω
1x USB cable
USB Port (Firmware Upgrades Only)
1x SMOK Band
Spare Parts
User Manual
Warranty Card

Mod Specs: GX2/4 MOD

Material: Stainless Steel
Sizes: 87.2 x 46 x 26mm or 87.2 x 59 x 44
Net Weights: 137.2g or 204.9g
Output Power Either: 6W –220W (Minimum Requirement 2x 18650 Batteries)
Or: 6W-350W (Requires 4x 18650 Batteries)
Standby Current: <500uA
Resistance Range: 0.10Ω – 3.00Ω (VW mode) 0.06Ω – 3Ω (TC mode)
Temp Range: 200F – 600F/ 100C – 315C
Multiple Safety Features Included
18650 Batteries (Not Included) Only Use Batteries Recommended By The Manufacturer For This Device.

Tank Specs: TFV8 Big Baby Tank Standard Version or EU Version

Material: Stainless Steel Construction with Reinforced Pyrex Glass
Threading: 510
Wide bore Drip Tip
Height: 56mm
Diameter: 24.5mm
Net Weight: 60g
Top-Refill Design
Adjustable Bottom Airflow control Ring
E-Liquid Capacity 5ml Standard Kit (2ml TPD Compliant Version For EU Available)
1x V8 Baby Q2 (3.0T) 0.4Ω (pre-installed) 40-80W (Best 55-65W)
1x V8 Baby T8 (4.0T) 0.15Ω 50-110W (Best 60-80W)
1x V8 Baby Q2 EU 0.4Ω Dual Coil (pre-installed) 40-80W (Best 55-65W)
1x V8 Baby Q2 EU 0.4Ω Dual Coil 40-80W (Best 55-65W)
Available Coil Options
V8 Baby Q2 0.4Ω
V8 Baby T8 0.15Ω
V8 Baby Q2 EU 0.4Ω Dual Coil
V8 Baby Q2 EU 0.4Ω Dual Coil

For a more detailed description of the operation and menu options available with this kit, please refer to the included user manual.

Recommend Retail Price for the GX2/4 Kit: £59.99 $69.99

Tools Of The Trade & Safety Information

People can suffer from allergies to chemicals that may be present in the makeup of certain types of E-liquids or produced in their vapour. People can become sensitive to, or even allergic to Nickel or Titanium used in Temperature Controlled designed coils. Seek professional medical advice before using any of the products used in my reviews.

For an in depth look at battery types, performance, and safety information, follow this link to the Mooch Facebook page.
You can also find the Mooch Blog over at ECF.

You may also find this range of calculators provided by Steam Engine particularly useful, so thank you to Lars for allowing me to include them in my reviews.

These calculators are currently under development, and the information that they contain may change at any time without notice. Please read the How It Works section for a more in-depth understanding.

The Juice

In this review, I have used a selection of E-Liquids from the extensive Mighty Vapors Collection. UK retailers can purchase these exquisite E-liquids and other current Premium US lines from Virtual Vapours Here


Bang For Your Buck

The Device

The GX2/4 has been cleverly engineered to offer you two versions in one, thanks to the interchangeable battery doors which can facilitate the inclusion of up to four 18650 batteries or, by switching the door panel a slimmer and more portable version with only two 18650 batteries installed.

SMOK not only has a strong reputation for creating original and appealing concepts, but including all the safety features that we have come to expect from a Company offering such quality products at affordable prices and always with their consumers wellbeing in mind.

A refined power bar has been placed along the outside edge of the main body of the device, with a combined up and down toggle switch that has two pronounced nodules for easy identification that can be easily accessed in the lower portion of the OLED screen.

The user has the option to vape in either Variable Wattage Mode from 6W up to a maximum of either 220W or 350W, depending on whether you are using the 2x or 4x mission bay compartment or Temperature Controlled Mode (between a Temperature range of: 200 – 600°F |100 – 315°C) by selecting either option from the menu.

The user OLED interface is large, bright and very well laid out thanks to the latest chip technology currently being used by SMOK in their latest box mods.

This allows for easy access to all the menu and submenu structures including, Variable Wattage Mode and Temperature Control Mode in either Celsius or Fahrenheit, with the ability to pre select the type of wire you chose to use whether it be Ni 200, Ti or SS.

You will notice one change on the OLED display when you change between dual and quad battery setups as an additional two indicators will be displayed. In dual the display AB and in quad ABCD.

Press the power switch five times in quick succession to turn the device on and a further three clicks once the device has been activated to gain access to the top menu structure (Mode, Puff, Setting and Power).

One press of the power button cycles through the available options to you and by holding the power switch in for a little over one second gives you access to that menu and any of its underlying sub-menus.

You can make all the necessary adjustments to fine tune each of the individual settings by using the combined plus and minus switch positioned just below it.

By selecting Power from the top tier menu you will be able to turn the device off.

For a more in-depth view of the GX2/4 Kit and its features, please consult the included user manual and make sure you are using the recommended batteries only. A thorough understanding of battery safety is imperative when using this type of device.

The TFV8 Big Baby Tank

The TFV8 Big Baby tank with greatly improved coils compared with earlier versions in this Sub-Ohm series of tanks, helps to improve both the vapour production while at the same time enhancing the overall flavour.

SMOK have also included the option of a 2ml capacity version as well as the 5ml to meet with the current TPD regulations for Europe.

Thanks to its revolutionary rotary top cap design SMOK has once again made filling the tank a very simple and straightforward procedure. However, please remember to use the elongated opening adjacent to the circular hole in the centre to fill it.

The bottom airflow system which consists of two wide airflow slots is more than adequate and keeps the circulation of air flowing around the coil heads at the GX’s maximum output of 350W.

Please remember that the TFV8 Big Baby Tank is designed mainly for huge cloud production so the airflow, even though it is fully adjustable, is not restricted enough to create a tight draw associated with smoking a traditional cigarette.

Clearly, you will need to prime the installed 0.4Ω Japanese Organic Cotton Coil prior to use which can be accessed by unscrewing the base of the tank.

Once this process is complete attach it to the main device (battery) via the 510 connector on the top and power up the GX2/4. The intelligent firmware will automatically detect that a new coil has been attached and will ask you to confirm this by selecting Yes on the OLED display.


The Good

Yet another original concept from SMOK, the GX2/4 gives you the option of Increased power with maximum performance or, a slimmer less cloud intensive alternative all in the one package.

Layout of the OLED screen helps to make navigating the menus a breeze, even for newcomers to the SMOK brand.

Whether you have a personal preference for temperature controlled vaping or, variable wattage this device has both with a dedicated set of built in safety features to keep you as safe as possible to.

Again, cloud production and flavour are extremely good with this kit thanks to the inclusion of the TFV8 Big Baby Tank and their well-designed coil heads which help in reducing the risk of a dry hit at higher temperatures, thanks to their wide liquid inlets and of course the two wide airflow slots positioned at the base of the tank.

For firmware upgrades you can connect the GX2/4 using the supplied micro USB cable directly to your internet source. You will find the connection port situated at the bottom of the OLED screen. A small point worth mentioning here is that it would look more presentable if it were on a horizontal plain rather that the vertical.

The Bad

Like the GX350, I noticed that the battery doors opening and closing is just a little bit problematic and needs some attention prior to its final release. Its works, but just not as easily as I would have initially anticipated. A top airflow system for the tank would be most welcome also to help minimise the possibility of leaking.

Finally, the power bar. It functions well, but not as well as I have found on previous models.

Two suggestions here would be one, replace the power bar with a horizontal wraparound power switch like the on the New G150 Kit but clearly larger. And two, again like the G150 kit, have an enclosed fixed battery instead of the replaceable option. I feel sure that the GX350 would benefit greatly from this type of redesign and become even more appealing to the user than it already is.

And one further consideration would be to release the GX2/4 as two separate entities with built in batteries instead of the current replaceable option.

Finally, supported charging of the batteries via the USB port would be a useful addition rather than just supporting firmware upgrades.

And The Downright Ugly

It’s yet another fine example of a well thought through vaping kit from SMOK that needs some attention in the final release so, I have nothing to report on the GX Kit in this section.

All products are sent directly by the manufacturer for review


3rd Floor of TeAn Jiejing Nengyuan Technology Building,
Langshan 2nd Road,
Northern Area of the Science & Technology Park,
Nanshan District,
Shenzhen China
+ 86 755 26977815 (For inquiries)

Copyright © 2017 Vape On Watt Reviews

All rights reserved. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the publisher, except in the case of brief quotations embodied in critical reviews and certain other noncommercial uses permitted by copyright law. For permission requests, write to the publisher addressed “Attention: Permissions Coordinator.