Kimsun TC40 Mini Kit Review

Kimsun TC40W Mini Kit Introduction

The Kimsun TC40W Mini Starter Kit is a new mod and tank combo from Kimsun, a company whose mission apparently is to “promote the life quality for humans”.

Questionable mottos aside, what we have here is yet another new entrant to the ever-popular stealth mod market.


The TC40W kit comprises of a positively tiny 1100mAh internal battery mod, alongside a tank with an equally tiny capacity of 1.1ml.

In The Box

  • TC40W Mini Mod
  • STL Tank II
  • 1 X Pre-installed 0.32 Ohm Titanium Coil
  • 1 X Spare 0.32 Ohm Titanium Coil
  • 1 x USB Cable
  • 1 x Manual

Main Features / Specs

TC40W Mod

  • 34.6mm X 21.2mm X 99.3mm
  • 1100mAh Battery
  • Wattage Range 5.0-40W
  • TC Resistance Range 0.15-2Ω
  • Temp Range – 300-600°F / 150-315℃
  • Charging Time – <2hrs


  • 1.1ml Capacity
  • 510 Thread
  • Bottom Fill
  • 510 Drip Tip

Design and Build Quality

Size and Finish

There’s no doubt that the TC40W is a contender for the smallest regulated box mod on the market, it’s one of those mods where the pictures just don’t do it justice.


It’s roughly similar in size to the Artery Nugget, however, its tapered sides make it feel far smaller in the hand or pocket, while also making it extremely comfortable to hold.

Indeed, the mod and tank combined literally disappear in the palm of your hand, making this the stealthiest of stealth mods.

While it’s incredibly light and even has a fairly pleasant rough and grippy texture, it also has a small gap on one side where the top plate meets the body, though it’s worth saying that may just be the sample I was sent.


Also, the logos on the sides in simple red print feel like this has just been branded rather than designed with care from the ground up. This doesn’t effect the performance in any way, though.

The buttons are nice and clicky with no rattle, but overall there’s a lack of solidity, unlike some other mods I have tried.

Design and Features

One thing that does set this mod apart from the crowd is it’s bright, easy-to-read screen, hidden under the chromed top plate in a two-way mirror effect.


It’s something that will divide people, but I think it’s a really nice solution that manages to keep the mod relatively ‘clean’ looking.

The downside is that with no stealth mode, the brightness can be distracting while you’re vaping due to it being directly in your line of sight. This can be rectified with a strategically placed finger.

Alongside the screen is the spring-loaded 510, with other tanks that I tried (though oddly not the STL tank included) all sitting nicely flush against the mod.

However, the positioning of the 510 means that despite the nominal 21mm width of the TC40W, any tank over 18mm will have an overhang, which may be a problem for vapers using their own tanks.

Unless you’re using something like a Kanger Subtank Nano, then sticking a different tank on this mod isn’t really a great option. But then again, the whole point of this kit is to supply a one stop tiny steal set up.


On the bottom of the mod is the USB charging port, which will obviously be a downside for some as many prefer to stand their mod upright when charging, and it also appears to be the only place for venting should you have the battery malfunction.


With the unrelenting rate of progress in the vaping market, using the STL tank ultimately feels a little like going back in time. kimsun stl 2 tank

The tiny coils and capacity of 1.1ml may make sense with such a small mod, however, the fiddly bottom-fill proved difficult to fill at times.

I guess that’s the price you have to pay for such a small tank.

Build quality is fine, it rather resembles a shrunken Subtank Nano, but again fit and finish just isn’t quite up there with the best, and it also doesn’t quite sit flush on the mod.

It feels like a tank created for a mod, rather than a tank created with the goal of being a great tank.

How Does The TC40W and STL Tank II Perform?

We will first take a look at the TC40W mod functions and how they work.

  • Lock/unlock – 5 clicks of the power button
  • Menu select – 3 Clicks of the power button to enable mode switching, then 1 click to go between Power/Ti/Ni
  • In Temp Control mode – 1 Click of the power button to switch between (℉) and (℃)

The menu is fairly straight forward to use for those who have used box mods before, and it should be noted that the mod is also firmware upgradeable which is a great feature for today’s devices.

There’s no constant display of battery life (it appears when you press the power button but not while vaping). The display does have to fit into a fairly small space though so Kimsun have had to work around showing certain features in the display.


The manual is not the easiest to read, this certainly wouldn’t be something I’d recommend to a new vaper as a starter kit. Kimsun are putting temp control centre stage here with only Ti coils included, and I think a lot of new vapers would be frankly baffled when trying to set this kit up.

So just to keep in mind if you are a newer vaper.

Battery Life

Using the STL tank in TC mode, I actually found the battery life surprisingly decent.

Yes, it’s only 1100mAh, however, it lasts long enough for a few hours of casual vaping when out and about.

When I paired it with a Subtank Nano in power mode, at higher wattages (a word on that below) it unsurprisingly drained the battery fairly quickly, but the trade-off for such a small size will certainly be worth it for some people.


Despite the tanks shortcomings, the tank performs better than you might first expect.

The drip tip is relatively (though not super) wide-bore and seems nicely made with double o-rings and a Delrin inner section, while the airflow is adjustable at the collar from extremely airy to fully restricted.


For vapers into temp control it could certainly be an option as a super portable setup, however, you do of course need to take into account the tiny capacity and fiddly filling system.

It can certainly kick out clouds though, and flavour is not too bad considering the coil size, if slightly anaemic.

Throughout my use I experienced zero leaking so well put together in that sense.

A word about variable wattage mode: this mod feels extremely under-powered. Vaping a Subtank Mini at 15w felt more like 10w in direct comparison with a Cool Fire IV.

Even when I took it up to 30w, it didn’t punch like the Cool Fire at 15w. Perhaps that’s just my unit, however, it should be noted for those looking to use this as a standard regulated mod.

What I like

The form factor here is great, it’s a tiny mod that’s actually comfortable to use and you’ll barely notice it in your pocket.

It would be a great spare mod to chuck in a bag or your glove box, ready for emergencies.

The tank performs better than expected, while of course, we have to judge it by today’s standards, it’s light years ahead of the kits from a few years ago. I didn’t get any leaking whatsoever.

Battery life is surprisingly good, and it packs an incredible punch for something in such a tiny package.

What I Didn’t Like

Build quality is only average and I personally found the tank is fiddly to fill. Maybe expected considering how small it is but let’s not forget that with a tiny 1.1ml capacity, you will be filling it a lot.

The display has no constant battery indicator, and the lack of stealth mode also means it can be distracting if using in a situation where stealth vaping is needed.

Though described as a starter kit by Kimsun, I would say it’s more suited to vapers who already have a TC mod that just want a portable, stealth device.

Final Review Verdict


  • Good tank performance & no leaking
  • Upgradeable firmware
  • Tiny size
  • Bright screen
  • Comfortable to use
  • Decent battery life for its size


  • Average build quality
  • Size limits use with other tanks
  • No stealth mode
  • Tiny juice capacity
  • Fiddly tank filling system
  • Wattage mode feels decidedly under-powered

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Kimsun TC40W review by VapeMaster


Kimsun TC40W Mini Kit

The TC40W manufactured by Kimsun is an incredibly small and lightweight device that supports Variable Wattage and Temperature Control. Intended as starter kit for new vapers the device offers up to 40W of power and supports both Ni200 and Titanium coils in Temperature Control mode. In addition the tank comes with a small tank that has fully adjustable airflow.

Kimsun TC40W Mini Kit features

  • Dimensions: 34.6mm (L) × 21.2mm (W) × 99.3mm (H)
  • Output Wattage Range: 5.0-40W
  • Variable Wattage Mode
  • Temperature Adjust Range: 300-600°F/150-315℃
  • Temperature Control Functionality. Supports Ni200 and Titanium
  • Battery Capacity: 1100mAh
  • Resistance Range 0.15-2.00ohm
  • Charging Time: 2 Hours
  • Standard 510 Thread
  • Standard Safety Features: Low Voltage Protection, Short Circuit Protection etc

STL Tank II features

  • 1.4ml Capacity.
  • Coil Resistance: 0.32ohm.
  • Pre-installed 0.32ohm Titanium Coil.
  • Adjustable Airflow.

What’s in the box?

  • 1 X TC40W Mini Mod
  • 1 X STL Tank II (with 0.32 ohm Titanium coil pre-installed)
  • 1 X Replacement 0.32 ohm Titanium coil
  • 1 X Micro USB Charging Cable
  • 1 X User’s Manual
  • 1x Coil Priming Card

    Kimsun TC40W Mini Kit styling and build quality

    The TC40W is an extremely small device, remarkably even smaller than the iStick Pico. The device itself is light as a feather yet despite this the overall build quality is excellent and it feels rather durable!

    The device offers up to 40 Watts of power and has Temperature Control functionality for Titanium and Nickel coils. The kit comes with two Titanium coils and a very well made and compact tank.

    The three buttons on the device work well, are responsive and rattle free. The LED style display located on the top of the mod reminded me very much of an old calculator but it is very bright and clear and certainly decent enough for such a compact device.

    The 510 pin does not appear to be spring-loaded and while the included tank fits perfectly be prepared for some gaps if you want to use other atomizers. Remarkably my 22mm Achilles II RDA sat flush with only ever so slight overhang and it actually looked far less ridiculous on this device than you might think. I am sure that the manufacturer ideally wants you to use the included tank but at least the option is there to use other atomizers assuming they fit.

    The TC40W is fitted with an 1100mAh capacity internal battery which should be more than sufficient for a new or very modest vaper. I must admit I really did like the finish of this device since it has a really clean look and the logos that are present are very subdued.

    The included STL II tank is a beautifully made atomizer and all the parts fit together really well. The tank has a 1.4ml capacity and adjustable airflow. Sadly it does not feature top filling but you can’t expect everything.

    There does not appear to be any venting on this device but I assume it vents via the Micro USB port which is located on the base. I certainly did not find the TC40W becoming especially warm when vaping so I am sure there is sufficient ventilation. The device can be charged via the included Micro USB cable and it takes roughly two hours to replenish the battery.

    Ease of use

    • Five clicks of the fire button turns the device on/off.
    • To enter the menu click the fire button three times. Click it again to cycle through the various options: PPP (Variable Wattage Mode), Ti F (Titanium Fahrenheit), TI C (Titanium Celsius), Ni F (Ni200 Fahrenheit) and Ni C (Ni200 Celsius).
    • There are three buttons on the TC40W Mini, all on the front of the mod; the fire button and the “+” and “-” buttons. The LED display is on the top of the TC40W Mini.
    • Wattage changes are in 0.1 increments and Temperature changes are in single degree increments.
    • Pressing the fire button with the TC40W Mini in standby mode the LED will display the battery level as a percentage. Then it will display your selected temperature or wattage.
    • In Temperature Control Mode the display will first show the Resistance of the attached coil as you press the fire button to vape.
    • The included STL II is a bottom fill tank. Unscrew the base to fill it. The fill holes are reasonably large so you shouldn’t have any issues.
    • When using a new coil always remember to put a few drops of juice into the centre of the coil to prime it.
    • To calibrate the Resistance of a new TC coil hold the plus and minus buttons down simultaneously for a few seconds until the display reads “CHE.”


      Considering how small the device is I wasn’t expected mind-blowing performance from the included tank but it actually vaped extremely well. I tried it with a couple of different liquids both were 50/50 mixes and the flavour was surprisingly good. The coils offered very clean and crisp flavour and the vapour production was also quite decent considering the size of the coils.

      The draw from the tank was really nice, perhaps a bit too restrictive for myself but probably ideal for people who have recently quit smoking and require a very tight mouth to lung vape!

      Temperature Control seemed to work without issues and I got a consistently good vape. The only real downside to this device is that if you are heavy vaper like myself you will run the battery down very quickly but more modest or new vapers should hopefully get more mileage out of it.


      In my opinion as a first product from a new manufacturer the Kimsun TC40W is a really nice device which may be ideal for a new vaper! The standout features of this device is the fact that it is seriously small, lightweight and surprisingly despite its diminutive statue offers a pretty decent vape! In addition it is simple to operate. The overall machining of the device is really good and the tank itself is extremely well made and fits together beautifully!

      Sadly the tank only holds 1.4ml and I feel it should have been at least 2ml capacity and ideally should have had top filling. The most telling problem with this device is that the price you really pay for such a beautifully compact device is a massive compromise in battery life because it does drain really fast and even faster in Temperature Control Mode. However this may not bother some people and it will depend entirely on how much vaping you plan to do per day. Obviously this device will never appeal to vapers who want long battery life and high Wattage but let’s face it that is not who the device is aimed at.

      I could see this device being quite handy for anyone who travels or simply needs a discrete device to use during their breaks at work. The TC40W might also be a great starter device for some but make sure you are aware of its limitations.

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