The OBS KFB AIO kit is a really simple all in one (AIO) Sub Ohm mod which uses a single 18650 battery which is not supplied.

I haven’t had much to do with any OBS devices or products so let’s see how this gets on!

OBS KFB Main ImageThis comes in 5 colours : White, Cyan, Red, Silver and Black.

OBS KFB AIO coloursThis is for similar users to the SMOK Stick AIO – a simple sub ohm device – for people who want zero maintenance or for use as a second device.

The specifications are a bit hard to find – I can’t find out the output power. Which is quite important info when choosing a device for most people. I have looked around the internet and seen it can reach maximum of 50W power depending on battery type and charge status – however this is unconfirmed as not shown on OBS website.

Also struggling to find which coils go in this.

What’s In The Box

  • KFB AIO Mod
  • 2 x BVC 0.3ohm coil (1 pre-installed)

OBS KFB AIO box contents


  • Size : 20x130mm
  • Material: 304 stainless steel
  • Weight: 79g
  • E-liquid capacity: 2ml
  • 12mm wide bore resin drip tip
  • Battery: 1x 18650 (not supplied)
  • Adjustable air flow
  • Side filling


Build Quality & Design

OBS KFB AIO Size comparisonI was sent the black version to review.

The packaging is very bare – not being familiar with this model I was thinking they had forgotten to send me a USB cable. Until I unscrewed the bottom and found it took a 18650 battery.

I’m struggling to see if there is any battery indication light. The fire button lights up when you press it.

This is a lovely looking bit of kit; it has a resin drip tip in shades of black to compliment the body. The body is mainly black with silver metal accents and multiple clear viewing windows.

The drip tip seems to not want to push in fully leaving a tiny gap. This is hardly noticeable but a bit niggly! Also it makes the drip tip feel a little bit wobbly. Plus the drip tip smashed into weeny pieces when this fell off the coffee table!

Other than the drip tip this feels quality – no rattles or wobbles and feels like it is as hard as nails!

The finish is a kind of matt black finish – one of those finishes which is a finger print magnet. I also spilt some liquid and that is still showing despite wiping many times!

The bottom cover unscrews for the battery.

You can remove the drip tip to change it for one you like. You can remove the top part of the device to change the coil. The top of the tank just lifts up to access the filling slot for e-liquid. This also has adjustable airflow.

The lift up cap that covers the juice filling slot can hold a bit of e-liquid – sometimes moving this cap will release the liquid to run down the side of the mod. Not a huge amount – but it is a bit annoying.

I think the build of this mod is great and it’s not too heavy even with a battery installed.

You have no charging port at all on this – so you will need to buy good quality 18650 batteries and a good quality charger and charge the batteries externally.

For information about battery safety please read here.

OBS KFB AIO componentsIn The Hand

OBS KFB AIO in hand

How Does the OBS KFB AIO Kit Perform?

Basic operation

5 clicks of the fire button to turn on and off – the button will flash to confirm this.

Turn the ring below the drip tip to adjust air flow- you will see the slot open and close up as you adjust. I usually set it in the middle to start with.

If you are a MTL vaper you will want less airflow typically and a DTL vaper will want it quite wide open. But these are typical settings you have the ability to tailor this for yourself.

For an explanation of the terms MTL and DTL – read here!

OBS KFB AIO AirflowHow To Fill The OBS KFB AIO

  • Pull up on the metal part which has the KFB branding.
  • This reveals the liquid filling slot.
  • Fill the tank – I would stop just before the filling hole.
  • Slide the top part back into place.

OBS KFB AIO FillingHow To Change The BVC Coil Head

If you get horrible burnt taste or poor output this usually indicates the coil head requires replacing. Also check the tank liquid level as often an empty tank will cause the same problem.

  • Unscrew the top of the device (just below the drip tip).
  • The top of the device is also the airflow ring so this may turn initially.
  • Unscrew the old coil if installed.
  • Screw on a new coil.
  • Screw the top cap and coil onto the tank before filling. If you screw the coil into the filled tank it can overflow and leak liquid.
  • Prime the coil by filling the tank and leaving the device to stand for 5-10 minutes.
  • Take a few inhales on the drip tip without pressing the fire button.


Flavour & Cloud Production

I am using an 80%VG E-Liquid in this – Cloud No 5 my current favourite. I have used this in a lot of devices so I find it easier to compare if I am getting the taste and vapour I expect.

Further Reading: What is PG and VG in E-liquid?

0.3 ohm BVC Coil

OBS KFB AIO Coil installationThis is a BVC coil with an apparently optimal performance level between 35-50W. Wish I knew the output power of this mod!

I filled this device and left it for half an hour to soak into the coil

This does like to make a bit of a hiss during firing- which is to be expected it is a sub ohm coil on a powerful device.

This gives a wonderful vapour volume and quite a warm vape – which I like as I think a warm vape brings the flavour out more.

I recently reviewed the SMOK Stick AIO which is very similar in principle to this but has 0.23 ohm coils. I found them very fierce, spitty and very hot. This is slightly gentler and much smoother.

By default I am a MTL vaper and found even though the drip tip is large I still was able to MTL well with a good flavour and vapour. I set the airflow to nearly closed. It’s not as restricted airflow as some MTL devices but was good enough for me, I’m still a smoker and found this gave me a good throat hit too.

With DTL vaping this comes alive even more – wide open airflow, huge vapour and still great flavour. Huge throat hit which made me cough on the first inhale haha! What a DTL wuss!

This is a cracking vape for both styles it really is! I have been using this for about 10 hours now and only smoked one cigarette – so it is doing it’s job!

Battery Life

This uses replaceable 18650 batteries which you will have to buy separately.

OBS KFB AIO Battery InstallYou will also need a good quality external battery charger as you cannot charge the batteries when they are installed.

Make sure to carry, charge and use the batteries safely – this is critical with removable batteries and always buy good quality goods from well recommended vendors.

My batteries are Samsung 30Q which are well rated and make sure to buy genuine as there are a lot of fakes out there.

My 30Q battery will run my Pico Mega for about a day at low wattage. So I can only compare the battery life to that. This is running at a higher wattage when the battery is fully charged so battery life will be different.  Other batteries will perform differently.

After a few days of use – I actually haven’t managed to fully drain the battery. I have been out and about a lot – driving to the hospital etc. So before going out I have put a newly charged battery in to make sure I have enough to last me until I get home. I didn’t want the battery conking out on me on my 1 hr 15 min drive each way.

This has easily lasted the 5-6 hours I have been away from home with no drop in performance at all.

Now this is the extent of how much I could test this – as then things went a bit wrong…

This did fall from the coffee table – which is when the drip tip smashed.

I replaced the drip tip and carried on using but ran into a few problems…

On the second day of use – whilst driving – I found the fire button was sticking on. I had to move it about with my thumb to get it to stop firing. Also at this point the 5 click on and off function stopped working – like it didn’t register all the button presses. I took the battery out – just in case.

Although this issue cleared the next day it returned! E-liquid oozing out of the fire button. Not good for a number of reasons but e-juice getting into the internals of the device is never a good thing. This leak was obviously causing the fire button issues.OBS KFB AIO Leak into fire button

Upon further investigation using a highly scientific method devised by our main man Jonny – involving tissue and sellotape – I found the source of the leak.

I cleaned out the liquid from the device and left it to stand for a few days to let it all dry out. I filled the tank without the coil or top cap in – thus ruling out leaks from the filling slot cover. The source of the leak is the tank window above the fire button. Hence the liquid entering and oozing from the button.

Now it looks like this taking a nose dive off my coffee table may have dislodged the tank glass. Which is such a shame. So I am now unable to continue using this.

OBS KFB Tank Leak

What I Like

This feels and looks great. Also very easy to use. The throat hit in particular for MTL and DTL is amazing, it has kept me nearly off the ciggies for about 10 hours!

One smoke in that time is pretty good for me – and things here are as stressful as they get right now!

What I Dislike

First up the instructions are poor. No excuse really and as a prospective ‘newer user’ device they should be more comprehensive.

The drip tip is a bit of a downside, on top of it being wobbly, this device fell onto the floor and the tip just smashed. So I am now having to use it with a 510 drip tip off another tank – such a shame as the resin drip tip is gorgeous – although fragile!

One drop on the floor and the tank started to leak – rendering the device pretty useless. So I have marked down the build quality as a result.

Final Review Verdict

I thought the OBS KFB AIO was going to be a go to kit for me with a stellar rating as a result. As it stands I can only go off my personal experience when using the device.

When it wasn’t leaking it was an excellent vape but one knock and it was no more. Hence the slightly less in depth review – sorry! I did want to test the battery life and if it did display the battery charge remaining. Also I wanted to give you an indication of the coil life – but I can’t it’s not playing any more!

Such a shame as I have loved this otherwise.

Have you tried the OBS KFB vape pen? Let me know how you got on with it in the comments below!


  • This is gorgeous!
  • Side/top filling – very easy
  • Multiple viewing windows for liquid level
  • Not heavy even with battery installed
  • Excellent airflow adjustment
  • Really smooth vape – not spitty or gurgly
  • Huge vapour output and taste for both MTL and DTL with airflow adjustment
  • Good value
  • Really economical power usage – the battery life seems to be great.


  • All in one construction so not very easy to clean out
  • Very bare instructions
  • Wobbly fragile drip tip
  • You will need to buy batteries and a charger before you can use this.
  • Watch for fluid from the filling cover – make sure to clean up any drips.
  • Was not as robust as I thought it would be – one fall and started leaking.
Shell Ecigclick Photo
Michelle Jones

I am an engineer and Technical Author by trade. My journey in vaping began around 2016, in the days of Tornado tanks, Ego batteries and Variable Voltage. It took me a few years to fully quit smoking but I finally stopped in June 2019 and that is all thanks to vaping! 20mg Nicotine Salts are my hero! Oh and I am partial to a nice pod mod and Bubblegum e-liquid! I have reported on the latest news on Ecigclick since 2017 and love being part of this great team! My passion for Tobacco Harm Reduction has also led me to becoming a Trustee for the NNA (New Nicotine Alliance) aiding in Advocacy

Build Quality
Ease of use
Vapour volume
Replace if lost or damaged?
I am an engineer and Technical Author by trade. My journey in vaping began around 2016, in the days of Tornado tanks, Ego batteries and Variable Voltage. It took me a few years to fully quit smoking but I finally stopped in June 2019 and that is all thanks to vaping! 20mg Nicotine Salts are my hero! Oh and I am partial to a nice pod mod and Bubblegum e-liquid! I have reported on the latest news on Ecigclick since 2017 and love being part of this great team! My passion for Tobacco Harm Reduction has also led me to becoming a Trustee for the NNA (New Nicotine Alliance) aiding in Advocacy
obs-kfb-aio-kit-reviewI think this is great value for the price but factor in buying batteries and a charger too. Make sure you know about battery safety as this is more critical using removable batteries and external chargers. Sadly make sure you never drop this and wrap it in bubble wrap as one fall and it was rendered useless.


  1. Good review and everything covered clear and concisely. Battery safety a priority.

    Unfortunately your experience with the faults will put potential buyers off purchasing one, it certainly will me.


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