Innokin Cool Fire IV 40W Box Mod

The Innokin Cool Fire 4 is the latest model from the popular Innokin Cool Fire box mod range. This is a powerful and intelligent device that is capable of reaching 40W, with a large 2000mAh battery capacity and sub-ohm capability (down to 0.3ohms).

  • Variable voltage or variable wattage
  • Maximum 40W output
  • Built-in 2000mAh battery
  • Sub-ohm compatibility
  • Passthough charging capability
  • Multiple safety features
  • FREE SHIPPING on this product

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  • Variable wattage (6W - 40W)
  • Variable voltage (3V - 7.5V)
  • 12A maximum output current 
  • Standby current: 100uA max
  • Sub-ohm capability (minimum 0.3Ω)
  • Built-in 2000mAh battery
  • OLED display
  • Stainless steel 510 thread with spring-loaded connector (eGo adaptor included)
  • On / off switch on base
  • 3 click lock / unlock
  • Multiple battery level indicators
  • Micro USB DC 5V / 1A charging
  • Passthrough charging (‘Vape while you charge’)
  • A handy lanyard hole
  • Puff length count & total puff count
  • Flippable screen (ideal if you’re left handed)
  • Vrms DC current for power accuracy
  • Multiple safety features (low voltage protection, short circuit protection, overheat protection, over discharge protection, 15 second cutoff timer)
  • Heat dissipation vents
  • This is a genuine Innokin Cool Fire 4. Comes with a scratch and check panel on the box, which you can use to check authenticity of the device on the Innokin website.  

The Innokin Cool Fire 4 is the new generation of the popular Cool Fire box mod range. It’s a powerful and intelligent device that is capable of reaching 40W, with a large 2000mAh battery capacity, and sub-ohm capability (down to 0.3ohms).

The Cool Fire features a high quality build, made of lightweight molded aluminium that is designed to fit comfortably in the palm of your hand. The brushed aluminium finish gives the device a sleek look and comes in a range of gorgeous colours to suit any style.

A stainless steel 510 thread with a spring-loaded connector allows for a durable and seamless connection between the device and clearomiser (an eGo adaptor is included). It also features a handy on / off switch at the base for when you’re travelling or storing the device. Alternatively, you can lock / unlock the Cool Fire by clicking the power button 3 times.

A crisp OLED screen displays the voltage, wattage, atomiser / coil resistance and battery life. Voltage and wattage can be altered by holding the plus (+) or minus (-) arrow until the display starts flashing, then release the button and press again to make your adjustment. You can speed up the scrolling by holding the plus or minus arrows down.

The Cool Fire IV makes switching between variable voltage and variable wattage easy. Hold down the power button and the plus (+) button together to switch to wattage mode, or hold down the power button and the minus (-) button together to switch to voltage mode.

A great little feature of the Cool Fire 4 is the puff counter. To see how many puffs you have taken since the device was locked or switched off last, just hold down the plus and minus arrows together. You can also flip the screen by holding down these buttons for a longer period.

You’ll never be caught out with a flat battery again, as the Innokin Cool Fire has multiple power indicators. Firstly, the OLED screen displays a battery icon which illustrates how much power is left in the battery. Secondly, you can tell how much power is left by the light surrounding the power button:

  • Green: Fully charged
  • Yellow: Half power
  • Red: Battery is low, charge the device.

Lastly, a separate power indicator can be found by pressing the plus (+) and minus (-) arrows together. Eg. You have 3.75V of power remaining.

Don’t worry if you get caught short however, as this device has pass-through capability which allows you to vape while it’s charging.

The Cool Fire 4 is packed with safety features such as low voltage protection, short circuit protection, overheat protection (will display ‘too hot’), over discharge protection and a 15 second cutoff timer, while the built-in heat dissipation holes further prevents the device from overheating.

  • 1 x Innokin Cool Fire IV
  • 1 x Micro USB Cable
  • 1 x eGo Adaptor
  • Manual
This is a genuine Innokin Cool Fire IV that comes with scratch authenticity.

Customer Reviews

Items 1 to 5 of 9 total
per page
Fantastic and great customer service
I love this product very much and recommend it to many people
Review by Julie
1st mod
One of my first subohm capable mod, was very happy with its battery life and power.
Review by Chandler Bancroft
My mod of choice when on the move
I travel a lot for work, and when I do I take this mod with me rather than my rather hefty Reuleaux RX200.
The Cool Fire IV 40W is small but surprisingly powerful, even running an Aspire Cleito. Its ergonomic design allows it to sit comfortably in your hand, and the in-built battery is always reliable and quick to charge. Definitely the best beginner mod.
Review by Daniel
Always reliable
Very good battery, charges quickly and always reliable. Like that it locks it's strength and won't change in my bag
Review by Liz
Easy to use after being shown
Good battery. Easy to use after the girls had shown me much better than I stick
Review by Dana
Items 1 to 5 of 9 total
per page

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At ECigaretteDirect we pride ourselves on providing you with superb after-sales support, and aim to provide rapid replacements for any faulty device under warranty. This page details the warranties you get with your device, and how to get a replacement.

Charging Equipment

Your charger comes with a 12 month warranty.


All mods and batteries are under warranty for three months. 


All clearomisers (tanks) with the exception of CE5 clearomisers are under warranty for six months. CE5 clearomisers (tanks) are under warranty for one month.

Please note - these warranties do not apply to the coil within a clearomiser or tank which is a consumable product as below.


Coils are a consumable product, and as such, will be replaced only if faulty on arrival. Please let us know within 5 days of receipt if your new coil does not work.

What does your warranty mean?

We guarantee that your device is, and will remain, free from defects for the period of the warranty. Please note - this applies to faulty products, and not accidental damage (e.g. dropping on a hard floor!)

The above warranties are subject to our terms and conditions. Please click here for further information.

What if the warranty has run out?

We're still here to help! Many problems can be diagnosed and solved (or we can point you towards one of our helpful guides), so send us an email, give us a call for advice or pop into one of our stores for face-to-face support and help.

How do I get a replacement?

In the unlikely event you have a problem with your device, just contact our friendly customer service team on [email protected]

You’ll need to return the item (we can arrange pick up free of charge). If we are unable to diagnose and solve your issue, we’ll send you a replacement by Royal Mail First Class. It helps if you have your order number, but if not our team should be able to find your order using your email address.

What's in your e-liquid?

We take the quality, purity and safety of our products seriously. That's why each flavour and strength available in our E-Liquid ranges undergoes strict testing in Government approved labs, as well as our own in-house quality control processes. Only those that meet our stringent quality standards make it to our shelves. Find out more here.

Hassle Free Returns and Fast Delivery, Free Over £20

Order before 3pm for next day delivery.
At ECigaretteDirect we understand delivery speed is incredibly important. After all, if you’ve switched from cigarettes to vaping, you don’t want to wait for your vape!

That’s why if you place an order before 3pm Mon-Fri, it’ll be shipped the same day.
What’s more, if you place an order over £20.00 you get FREE delivery.

Delivery Prices and Speeds





Royal Mail 1st Class Standard Delivery

£2.99 or FREE for orders over £20

1-2 working days if purchase completed before 3pm.
Parcels ship Monday - Friday excluding bank holidays. 95% of orders arrive next day.

  • Signature required for orders over £40.00.
  • Orders over £40.00 are sent by recorded delivery.

Next Working Day Courier Delivery (DPD)

£3.99 or FREE for orders over £40

Next working day.
Parcels ship Monday - Friday excluding bank holidays.

  • Tracked - signature required
  • Online re-scheduling available 

International Delivery

Depends on country

Parcels ship Monday - Friday excluding bank holidays.
Delivery times 9-21 days depending on country.
here for countries we deliver to.

  • Tracked except for Australia.

Unfortunately, we can no longer deliver to addresses outside the UK but in the EU due to new EU regulations.

Hassle-Free Returns - & 90 Days to Change Your Mind

Need to return an item? We aim to make the process as easy as possible (it’s also free!).

We can arrange for a free pickup or for your product to be sent back free of charge.  There’s no need to fill in a complicated form - just send an email to our friendly customer service team on [email protected], give us a call on 01792 852843 or use this contact form.

When can I make a return?

  • When you have an unwanted present or have changed your mind - you’ve got 90 days to decide as long as you haven’t used the product ;)

  • You have a faulty product under warranty.

You can see our full returns policy in our terms and conditions here.

Not in the UK?

We also ship internationally, including Australia and New Zealand. You can see the full list of countries here.

The Right and Wrong Ways to Treat Batteries!

Following these simple steps can help you get the most out of your e-cigarette battery.

Battery Safety Information


  • Ensure you use the correct charging equipment for your e-cig (see below).
  • Charge batteries on a hard surface.
  • Turn your battery off when not in use.


  • Use damaged batteries.
  • Leave charging batteries unattended.
  • Allow contact between your batteries and water.
  • Carry in a pocket with coins or keys. (The KBag is a great way to carry batteries securely and safely).
  • Expose your battery to sunlight, extreme heat or cold.

For more information see our E-Cig Battery Safety Infographic.

Recommended Charging Equipment

We recommend the Veho Plug Adaptor and the Nitecore Intelli charger (for external batteries). Both are high quality devices from a reputable manufacturer, have performed well in testing and have the right voltage output for e-cigs.

Extending Your E-Cig Battery Life

With regular usage, your e-cig battery will usually last for 3 months, although they can last longer. The following steps can help extend the life of your battery

  1. Cleaning your battery terminal. The most effective way to do this is to use a cotton swab soaked in alcohol, but you can also clean it with a tissue or a cotton swab. 
  2. Keeping your battery charged. Keeping some charge in your battery can extend your battery life, especially if you go for some time without using it.

Also see: 9 Ways to Extend the Life Of Your Battery | Trouble Shooting Battery Issues