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Reviewed by thousands of real customers on Feefo Rated /5 from reviews

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Cool Fire IV 40W

by Innokin

In stock

The Innokin Cool Fire IV is a powerful and intelligent mod that fires up to 40 watts.

The mod comes with a long lasting 2000mAh battery capacity, an easy-to-use menu and a robust build with a brushed aluminium finish.

Also see the Coolfire Z50 mod for increased power.

  • Solid build that fits comfortably in the hand
  • Pass-though charging means you can vape while you charge
  • Multiple safety features
  • FREE UK SHIPPING on this product
  • Description

    The Innokin Cool Fire IV 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 moulded 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).

    Using the Coolfire

    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.


    • 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.  
  • Whats in the Box?
    • 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.
  • Reviews
  • Warranty

    At E-Cigarette Direct 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 see our full warranty information for further details.

    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 cover a free delivery 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.

  • Delivery & Returns

    Hassle Free Returns plus Free Delivery On Orders Over £15

    Tracked 24
    Usually next working day*
    Tracked 48
    Usually 2-4 working days*
    Up to £14.99 £3.99 £2.49
    £15 to £19.99 £1.99 FREE
    £20 + FREE -

    *Estimated delivery time based on working days and does not include weekends or Bank Holidays. Delivery times vary depending on location so please take into account typical service expectations in your area.

    Unfortunately, we can no longer deliver to EU addresses outside the UK 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!)

    Just send an email to our friendly customer service team on [email protected], give us a call on 01792 852843 or contact us on chat.

    When can I make a return?

    • When you have an unwanted present or have changed your mind - you’ve got 90 days to decide! Please note this only applies when you have not used the product, and it is in a resalable condition.

    • You have a faulty product under warranty.

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

    Not in the UK?

    You can see the full list of countries we deliver to here.

  • Product Care

    The Right and Wrong Ways to Treat Batteries!

    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.


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