Innokin Coolfire Z80 Kit Featured Image

Innokin Coolfire Z80 Kit Review With The Zenith II Tank

Richard WinterMods 2 Comments

Having won the Coolfire Z80 kit in a competition hosted by Innokin recently, I was really excited to receive it as I have to admit it’s been a while since I’ve used my existing Innokin mods…shame on me I hear you say!

Innokin Coolfire 1 Kit

Back in 2015, I first started my vaping journey when I purchased the Innokin Coolfire 1 mod with the iclear 30 and 30S clearomizers. It’s a stainless steel tube mod that originally took an 18350 battery but I upgraded it by adding an extension tube to accept an 18650 battery. It really did look cool and at 8.5W was fantastic. A little photo included for nostalgia.

Innokin MVP 1 Kit

For me, this really was the changing point and was the device that got me off the ciggies for good.

A little while later I purchased the original Innokin MVP box mod that was built like a tank, had an internal battery and what now seems like an ancient 7-segment display. 11W of pure fire-power and still worked effortlessly with the iclear 30S tank. Another little photo shot for nostalgia.

Both these devices I still own and yes, they are still working and still produce a satisfying vape. Back in the day these were the pinnacle of the vaping world.

Innokin Coolfire IV Kit

Since then I’ve owned a few coolfire IV’s (4) with the I Sub Tank which were also really good.

So far, all the Innokin mod kits I own have NEVER let me down and have always been of the highest quality. Testament that Innokin really do take quality seriously and do make mods to last.

Coolfire Z80 Pic 1

Just so you guys know, the Coolfire Z80 Kit I won was the UEFA Euro 2020/21 Limited Edition version that Innokin released in conjunction with the UEFA competition.

There is a little story behind this which I will briefly mention. When it arrived and I opened it up and saw the red, white and blue stripes I thought…yes, I’ve won the England variant. I took a photo and sent it to my mate only to be told what an idiot I was, it’s the French flag, as the England one would have the 3 lions on it.

Although slightly disappointed, I do have to say I prefer this one now as the colors really do make it stand out. You will see what it looks like from the photos but just so you know, it’s only the coloring that’s different, the mechanics of the mod are exactly the same as the normal version.

Anyway, enough of my rambling on about the good old days, let’s get stuck into the Coolfire Z80 Kit review.

Innokin Z80 Kit with Coils

The Innokin Coolfire Z80 is a Mouth-To-Lung (MTL) and Restricted-Direct-To-Lung (RDL) device, powered by a single external 18650 battery and fires up to 80W. It’s essentially a variable wattage mod but with the really ground breaking and innovative Fourier FO technology that replicates alternating current by pulsing and switching the DC battery current that’s applied to the coil. This has the advantage of increasing flavor and prolonging the life of the coil.

It’s small, lightweight and resembles the styling of the original Coolfire IV. Incorporated into the mod is the Type-C USB charging port and a 0.96inch colored OLED display screen. And of course the proven track record of reliability and robustness of all Innokin devices.

Coupled with the Coolfire Z80 is the newly updated Zenith II Tank. It’s a quarter turn top fill (fill port visible from top) with bottom adjustable single slot airflow. It holds a maximum of 5.5ml (2ml EU version), has a 510 drip tip and accepts the range of Innokin’s Z coils.

There are 4 different colors in the Innokin Coolfire Z80 Kit range; Ash Grey, Cloudy Grey, Leather Black and Leather White. The frame of the Coolfire Z80 comes in 3 colors; Gunmetal Black, Dark Grey and Steel Silver. The Zenith II Tank comes in 3 colors that match the frame of the Coolfire Z80; Stainless Silver, Gunmetal Grey and Black.

Carry on reading to see what we thought and get into the nitty gritty of the workings and performance.

I would like to thank Monica at Innokin for sending me the Coolfire Z80 Kit with the Zenith II Tank. As always this review is completely unbiased and is my honest opinion of my findings on this supplied kit. If you click on any of the buy buttons, we may receive a small affiliate commission but at no extra cost to you.

Innokin Coolfire Z80 Kit Review


Features and Specifications

Coolfire Z80 Mod

  • Construction: Zinc Alloy
  • Dimensions: 83.55mm (H) x 38.30mm (W) x 27.60mm (D)
  • Weight: 88.4 grams (excluding battery)
  • Input Voltage: 3.2V – 4.2V
  • Charging: Type-C USB 5V/1.7A
  • Resistance Range: 0.1 – 3.5 ohms
  • Output Wattage: 6-80W
  • Output Voltage: 1V-7.5V
  • Output Mode: Variable Wattage, Frequency FO (20-500Hz), Coil Refresh
  • Output Current: 28.5A
  • Battery Specification: External single 18650
  • Chipset: 4th Gen Technology
  • Display: 0.96inch OLED Color Screen
  • Tank compatibility: 26mm (27mm max)
  • Firmware Upgradeable
  • Cut-Off Time: 3-18 seconds adjustable

Zenith II Sub Ohm Tank

  • Construction: Stainless Steel 304/Pyrex Glass
  • Dimensions: 51.7mm (L) x 26mm (D) (including 510 pin and drip tip
  • 36mm high excluding 510 pin and 510 drip tip
  • Weight: 68 grams (including coil)
  • E-Liquid Capacity: 2ml (EU version), 5.5ml Standard
  • Coils: Innokin Z-Coil Plug and Play Range
  • Filling Method: Quarter Turn Top Fill
  • Drip Tip: 510 Ultem and 510 Delrin
  • Thread: 510 Connector
  • Airflow: Bottom Single Slot Variable

What’s in the box?

Coolfire Z80 KIt Whats In The Box
  • Innokin Coolfire Z80 Mod
  • Zenith II Tank (2ml)
  • Innokin Z Coil 0.8 ohm (pre-installed)
  • Innokin Z Coil 0.3 ohm
  • Spare Drip Tip
  • Spare O-Ring Set
  • Type-C USB Charging Cable
  • Quick Start Guide
  • Warning Booklet

I would just like to point out and mention the packaging that the Coolfire Z80 kit comes in is made out of 100% recyclable cardboard. Even the spare coils are housed in thick paper sachets.

Well done Innokin, so nice to see this being done instead of the usual foam inserts and plastic/foil packaging.

Innokin Coolfire Z80 Mod Design and Appearance

The Innokin Coolfire Z80 is a Variable Wattage (6W-80W) and a Variable Voltage (1V-7.5V) mod. Two further modes have been included, these being the innovative and ground breaking Fourier FO and Coil Refresh options.

Fourier FO can be selected and applied to the standard variable Wattage or Voltage mode which will in effect switch the applied voltage to the coil at a cycle rate of 20Hz–500Hz. This switching cycle rate is selectable and will simulate the effect of an alternating current (AC) being applied. This new technology, previously seen on the Innokin Sensis mod, claims to improve the flavor produced from the coil as well as increase the longevity of the coil life.

Coil Refresh is a selectable option that will apply a short burst of lower power (40%) in order to help prolong the life of the coil.

Overall dimensions of the Coolfire Z80 mod are approximately 83mm high, 38mm wide and 27mm deep with the weight of the mod including the battery being 131g.

Its power source is provided by a single external 18650 battery which is accessed via the threaded bottom battery cap. Opening the battery cap is carried out by flicking out the flush mounted battery cap lever and unscrewing anti-clockwise. There is also an indent in the center of the battery cap to accept a small coin or screwdriver if you wish to remove the battery cap this way.

There are also 4 small battery venting holes in the battery cap to safeguard against any possible battery venting issues. Nice to see Innokin have included these as the last few mods we’ve reviewed didn’t have any.

Orientation of the battery is clearly marked on the inside of the mod housing with the polarity indicator being a red cross (+). This indicates that the battery is to be inserted positive end first. There is no negative (-) indicator on the battery cap.

The threaded 510 connector is centrally located on the top of the mod, be it slightly set back from the front of the device. This 510 connector is very slightly raised from the main body to protect the attached tank from scratching the surface of the mod.

Interestingly, the gold plated spring loaded center pin is oval in shape and not the usual circular shape. The width of the top surface on the Coolfire Z80 is 27mm so tanks over this diameter will overhang.

Control is achieved by the 4th generation chipset and the User Interface (UI) is a 0.96inch OLED colored display .It’s located on the front of the Coolfire Z80 in-between the fire button and the +/- buttons on a black matte transparent finger plate.

This screen is clear and crisp showing the vaping mode you’re in (wattage/voltage/FO), coil resistance, volts or wattage, puff counter, vape duration, frequency in Hertz, a visual indication of an AC sine wave or a cycling spectrum and the status of the battery.

Although the screen is not adjustable in terms of color or brightness, the color used on the menu screen is good and the display is bright enough to be viewed in most lights.

The Coolfire Z80 is made out of zinc alloy with a leather wrap-around design around the battery housing. The leather hide feels quite thick and is smooth to the touch. On some of the other color variants, the wrap-around is suede.

Firing the mod is carried out via a circular beveled button on the front above the OLED display and the two smaller +/- beveled buttons increase/decrease the wattage/voltage. The response and feel of the buttons are very positive with no button rattle at all. Ultra-fast firing speeds of 0.003 seconds are achieved by the 4th generation chipset.

Charging the Coolfire Z80 can be carried out via the front located bottom edge Type-C USB port, specified as 5V/1.7A. Firmware is also upgradeable via this Type-C USB port too.

Innokin’s branding is kept to a minimum, with their name “INNOKIN” stamped into the brushed alloy plate that secures the leather/suede wraparound on one side of the Coolfire Z80 and “COOLFIRE Z80” on the other side. Although the branding is quite large, its stamped into the alloy casing and is of the same color as the metal so is not obtrusive.

Accessing the menu structure is achieved by using a combination of the fire button and the +/- buttons. More detail of the menus is described later on in the Functionality section.

With regards to safety features, the 4th generation chip provides the following prompts such as:

  • 3-18 seconds timeout (vape cut-off)
  • Reverse battery protection
  • Low battery voltage (3.3V)
  • No coil/atomizer detected
  • High temperature warning cut-off (90oC)
  • Short circuit and low resistance cut-off.

Overall, the Innokin Coolfire Z80 feels very solid, robust and extremely well built. It’s pretty small, lightweight and feels very comfortable to hold. The bonus for me is the replaceable 18650 battery which is a great improvement over the original Coolfire 4’s.

What impresses me the most is that Innokin continue to lead the way with innovative designs and technology and strive to improve the vaping experience we as end user achieve and enjoy.

Innokin Zenith II Tank Design and Appearance

The Zenith II Tank is an updated version of the original Zenith tank. I’ve heard really good things about the Zenith but not actually owned or tried one. The updates to the Zenith II include a more contemporary look and the airflow has been improved to provide finer tuning for a MTL and RDL vape.

Gone is the riser that was on the original Zenith so now you can replace the drip tip with any 510 drip tip. The Zenith II can be stripped down and the glass removed for cleaning. Also included is an opening seal on the quarter turn top fill cap.

Zenith II View 1
Zenith II View 2

Constructed out of stainless steel and pyrex glass, the Zenith II is 51.7mm tall including the drip tip and threaded 510 pin, 36mm tall excluding the 510 pin and drip tip. The width of the tank is 26mm in diameter and the weight, including the coil is 68 grams.

The Zenith II tank has an e-liquid capacity of 2ml (EU version) or 5.5ml (standard version) and is a top fill design with a quarter turn lock/unlock twist operation. When open, there is a silicone rubber seal enclosing the fill port opening, simply pass the tip of your e-liquid bottle through the seal to fill.

Zenith II Fill Port Closed
Zenith II Fill Port Open

Etched into the top fill cap are the symbols for lock and unlock indicating which way to turn the top cap to unlock for filling or lock to close. The e-liquid fill port is a pretty decent size opening but depending on the type of e-liquid bottle you’re using, you may have to remove the drip tip to gain better access to the fill port.

When the top cap is twisted to the open position, continue turning to unscrew the top cap to remove it from the main body of the tank. It’s a secure tight fit so may require a little force to unscrew.

Zenith II Top Cap Removed
Zenith II Glass Half Out
Zenith II Glass Out

Once the top cap is removed, you have access to the pyrex glass that fits within the stainless steel frame. Simply slide the glass out from the frame if you want to clean it or if it’s broken and needs replacing. This glass fits either way round so no need to worry about its orientation.

An amber colored Ultem 510 removable MTL drip tip securely fits into the top cap with 2 O-Rings ensuring it won’t fall out. Included in the kit is a spare 510 wider bore delrin drip tip for RDL vaping.

Zenith II Airflow Cyclops
Zenith II Airflow 3 Small Vents

Airflow is achieved by the bottom quarter turn adjustable single cyclops slot. The airflow can be adjusted anywhere from fully open for RDL vaping which opens the full cyclops slot or slowly closing it down to the three, or two, or one small hole for MTL vaping. The resistance of the airflow ring is very good so will not inadvertently move unless you turn it.

Zenith II Tank Coil and Base Section

Unscrewing the bottom airflow ring knurled cap anti-clockwise opens up giving access to the Innokin push fit Z coils. Two coils are included in the Coolfire Z80 kit and are KA1 (Kanthal);

Z 0.8 ohm coil: 15W-18W – Kanthal – MTL
Z 0.3 ohm coil: 30W-40W – Kanthal Mesh – RDL

These coils do NOT screw in but simply push in. Two flat indents on the coil locate into the two flat indents in the base of the tank section. Removal of the coil is again pulled and NOT screwed from the tank.

Zenith II Tank Base View

A really neat feature on the Innokin Z range of coils is the threaded 510 connection to the mod is part of the coil and NOT the base of the tank. Every time you replace the coil you’re effectively using a new threaded 510 screw connector. Perfect in my eyes that if you cross thread the male screw, it’s only the coil that’s affected and not the tank itself.

Branding is minimal with the words “INNOKIN” and “ZENITH II” etched into either side of the bottom airflow ring. Also the usual CE markings, along with “DESIGNED BY P.BUSARDO VAPINGGREEK” and “PLATFORM SERIES” are etched into the bottom of the 510 pin base.

Stripping down the Zenith II tank is straight-forward and disassembles into 6 parts including the coil and 510 drip tip for easy cleaning and maintenance. Lots of spare O-Rings are included in the kit if any on the tank get damaged or lost.

Zenith II Tank Stripped Down

Overall I really am impressed with the machining of the threads and the quality feel of the Zenith II. Its solid, looks like it will take a lot of punishment and I really like the wrench style knurling on the top and bottom caps. The stainless steel frame not only looks really good, it does a great job of protection the Pyrex glass.

Innokin Coolfire Z80 Mod Functionality

The Innokin Cooflire Z80 mod uses a 0.96inch colored display to show all of the set parameters. Included on the 0.96inch colored display is all of the read-out information as follows:

  • Battery level indicator: Color change bar
  • FO / Wattage / Voltage selected
  • Wattage / Voltage levels
  • Lock / Unlock
  • A smaller Wattage/Voltage reading (opposite to what’s been selected)
  • Coil resistance reading
  • Puff counter
  • Vaping time reading
  • Graphical display: AC sine wave in FO, Flat line spectrum in W or V mode
  • Frequency in Hertz (Hz) when in FO mode

Changes to these parameters are carried out by sequential presses of the fire button and the + and – buttons.

Basic Operation

  • Fire button pressed 3 times turns the device on or off
  • Fire button and + button shows battery charge, coil resistance and puff counter
  • Hold + button till display flashes, then press + button to increase the wattage or voltage
  • Hold – button till display flashes, then press – button to decrease the wattage or voltage
  • Fire button and – button will lock/unlock the device (fire button still fires)
  • + and – buttons together will enter the menu options

Menu Options

Holding both the + and – buttons together will bring up the main menu with the following 5 sub menu’s.

  • Fourier FO mode: + button increases Hz, – button decreases Hz, fire button to select
  • Power mode: + or – button to select wattage or voltage, fire button to select
  • Refresh mode: + or – button to select auto or manual refresh
  • Settings mode: select screen display, set timeout, set cut-off, device ID, reset
  • Exit: returns you back to the previous screen

Settings Sub Menu

When the main menu is displayed, scroll down to the “SETTINGS” menu option using the – button. Once it’s highlighted, press the fire button and the following sub menu will be displayed.

  • Screen display: Minimal or Pro
  • Timeout: 5 seconds to 180 seconds
  • Cut-off: 3 seconds to 18 seconds
  • Device ID: Current code
  • Reset: Confirm or Back
  • Exit

While the Coolfire Z80 manual is very good in the description of the functions and menu’s, we’ve included a detailed description of some of the operations for greater clarity.

Powering up the Coolfire Z80

When you first install the battery and press the fire button, the display screen will display “Z80” with a message below saying “Click 3 X Power On”.

The default mode that it powers up in is FO in wattage mode. This is confirmed by the display indicating FO in the top left corner and the AC sine wave displayed underneath the numerical wattage number.

Increasing/Decreasing the Wattage/Voltage Level

Pressing the + or – button will have no effect in decreasing or increasing the wattage/voltage levels. If you want to increase or decrease the power levels, you will first have to hold down either the + or – button until the numerical power level flash.

When the display starts to flash, release the button and then press the button again. This will now increment or decrease, depending on which button you’re pressing, the wattage in 0.5W increments or the voltage in 0.1V increments.

The +/- buttons do a round robin so when you reach the maximum, the next press will take you to the minimum value.

Power Mode

Press the + and – buttons simultaneously to enter the menu mode. Scroll down to “POWER” and press the fire button. This will enter the sub menu of WATTAGE or VOLTAGE. Select the mode you want and press the fire button again.

The display will indicate the mode that’s been selected with either “W” or “V” displayed in the top left hand corner. The Fourier FO will not be enabled and the graphical display will show a cycling flat line.

If you’ve selected “Wattage”, the large numerical display will indicate “Watts” and the smaller bottom right value (underneath the coil resistance) will display the voltage that’s being applied to the coil.

If you’ve selected “Voltage”, the large numerical display will indicate “Volts” and the smaller bottom right value (underneath the coil resistance) will display the wattage that’s being applied to the coil.

Fourier FO Mode

Irrespective whether you’re in wattage or voltage mode, you can select the FO function to bring up Innokin’s flagship technology.

Selecting this mode will enable FO and ask you to specify the frequency you want FO to work in. The range available is from 20Hz – 500Hz.

Innokin recommend when vaping MTL to select between 51Hz – 100Hz and DTL between 20Hz – 50Hz.

Once selected, the FO icon will be displayed in the top left corner of the screen and the graphical display will switch to a sine wave. The bottom right hand numerical display will indicate the frequency you’ve selected.

As explained earlier, FO mode applies an alternating current (AC) to the coil. This has the effect of alternating the current rather than a flat line direct current. This in theory should increase the flavor produced from the coil as well as improving the coil life.

Refresh Mode

Another of Innokin’s advanced technologies, selecting this mode will enable you to automatically or manually select this operation. This mode will in effect apply a lower value pulse, (40%) to what you’ve selected to vape at, to the coil to help refresh the coil by pulling e-liquid through the coil.

When “Extended” is selected, pressing and holding down the fire button will start the “Refresh” cycle. The duration of the refresh cycle is determined by the length of time you hold the fire button down.

Screen Timeout

When selecting this menu, you can specify the length of time the screen will be displayed after pressing any of the buttons.

The default setting is 10 seconds, but you can select a value from between 5 seconds – 180 seconds.

This value will determine how long the screen will remain illuminated before it goes blank (sleep mode) if no button is pressed.


The default setting for this is 10 seconds. You can select any value from 3 seconds to 18 seconds.

When you press and hold the fire button to vape, the current that’s applied to the coil will remain for the duration that’s been specified in the CUT-OFF menu or sooner if you stop pressing the fire button.

This is a safety feature to stop accidental prolonged firing of the device. When the time is reached in the CUTOFF menu, the display will indicated “CUTOFF” and will stop firing.

Screen Display

Two different screen modes are selectable, MINIMUM or PRO.

PRO will show every parameter that is available while MINIMUM will omit the smaller parameters that are shown below the graphical display.

Innokin Zenith II Tank Performance

Zenith II Z Coils

Two coils from the Innokin range of Z coils are supplied with the Coolfire Z80 kit (0.3ohm and 0.8ohm) and are both Kanthal A1 wire material. The Coolfire Z80 only operates in wattage or voltage mode, there is no Temperature Control (TC) feature option.

For the purpose of these performance tests, I used the wattage mode and switched into the FO mode to see what differences I observed.

Z 0.3 Ohm Coil

0.3 Ohm Z Coil

Innokin specify the wattage range is between 30W-40W. Best at 35W. Suitable for DTL.

After priming and slowly bedding in the coil at a low wattage, I found the flavor and vapor started to kick in for me at around 10W. Slowly increasing the wattage up to 18W improved the flavor and vapor produced.

My sweet spot for this coil was around 25W in terms of good flavor and vapor production. With the airflow fully open I was getting a pretty decent DTL vape although slightly closing off the airflow did give me a really nice RDL vape style.

Taking the wattage on this coil beyond 45W did seem to change the flavor and if I continued to vape at this wattage I feel it would have burnt out. Keeping below 35W is ideal for this coil.

Longevity of the coil I’m afraid I can’t comment on as I switched to the 0.8 ohm a few times to try that one. I must have cycled around 60ml through this coil with no real loss of flavor.

Z 0.8 Ohm Coil

0.8 ohm Z Coil

Innokin specify the wattage range is between 15W-18W. Suitable for MTL

Once primed and bedded in, the flavor and vapor started to appear at around 8W. Increasing the wattage to 10W really started to bring out the flavor of my e-liquid and was producing quite decent vapor.

Settling at 14W seemed to give me the best results for this coil. Flavor was really good, giving a slightly warm vape and a really good MTL draw with the airflow set to just the 3 small holes showing.

Flavor wise this coil really did perform very well. The flavor was very impressive, definitely one of the best MTL coils I’ve come across.

I’ve been vaping this coil for the last two weeks nonstop and I really can’t fault it. There is no sign of flavor drop off at all.

Fourier FO Results

Switching between standard wattage and FO mode does change the flavor tones slightly and is noticeable when altering the frequency (Hz). Cycling different juices through the tank didn’t always have the same result when switching between the two modes.

One thing that was evident, when vaping in the FO mode, especially as low(ish) frequency, the cycling frequency can be felt. It’s not a smooth constant vape as you find in wattage mode, rather like a fast pulse or motor-boating.

Quantifying coil life is not easy when trying to make a direct comparison between the two modes. Coil life is impressive on the 0.8 ohm coil anyway so if FO does improve this even more then that can only be a good thing.

Refresh Results

I used Refresh in manual mode after I had increased the wattage on the 0.3 ohm coil to 45W and found the flavor was becoming muted. Once Refresh was carried out, the flavor from the coil did improve.

It’s quite difficult to gauge over a relatively short time if Refresh improves the coil life as there are so many different factors involved. The principle behind the technology makes sense so I can only assume it will do.

Any Leaks?

Throughout my time using the Zenith II tank there was no evidence of any leaks when using either of the supplied coils. Obviously as the coils get older leaking can start to occur but I can say that I’ve been switching both the coils in and out of the tank for 3 weeks now with no problems.

Innokin Coolfire Z80 Battery Performance

The Coolfire Z80 mod is powered by a single 18650 battery.

Battery performance is always subjective and depends on the type of battery you use and its condition, the power you vape at, the type of coil you’re using and your vaping style.

I opted to use my Samsung 30Q battery (20A/3000mAh) as I was only vaping at around 15W on the 0.8 ohm coil and was getting a good day and a half of vaping before I needed to re-charge. Switching in the 0.3 ohm coil and vaping at around 25W decreased my vaping time before needing to re-charge to one day.

The Coolfire Z80 indicates the status of the battery on its display so you can keep an eye on the remaining charge of your battery. The battery icon will change color and reduce in size as the charge diminishes.

  • 100% – 61% of charge = Green
  • 60% – 20% of charge = Yellow
  • 19% – 0% of charge = Red

Alternatively you can press the Fire button and + button which will show the battery icon with its appropriate charge color with a numerical voltage value below it.

Once the battery is depleted of its charge, the Coolfire Z80 will flash up a “Low Voltage” prompt on the display.

If you want to ensure you’re using the right capacity battery for the wattage you’re intending to vape at, you can use our Battery Amp Drain calculator to determine the most suitable battery for your vaping requirements.

How do I Fill the Innokin Zenith II Tank?

Filling The Zenith II Tank

The Zenith II sub ohm tank is a quarter turn top opening filling mechanism, it really is very easy to fill.

You don’t remove the top cap, just simply twist the top cap in the direction of the “unlock” symbol that’s printed next to the oval opening on the top cap. As you turn the top cap, the fill port with its silicone rubber seal will become visible. Continue turning till the top cap reaches its stop point.

Pass the tip of your e-liquid bottle through the opening of the silicone rubber seal and fill the Zenith II with your e-liquid.

Do note that some-liquid bottle tips may not fit too well into the opening if the drip tip is still in place. Remove the drip tip and continue filling.

Once filled, remove the e-liquid bottle from the filling port and turn the top cap back towards the “lock” position ensuring the white silicone seal is no longer visible.

Quick Tip: If you are filling the tank for the first time, drip a few drops of e liquid onto the wick of the coil first. Push the coil into the base of the tank then fill and leave to stand for approx. 10-15 minutes before you start to vape. This will help saturate the wick fully in e-liquid and help prolong the life of your coil.

How do I Change the Coil in the Innokin Zenith II Tank?

Unscrew the Zenith II tank from the Coolfire Z80 mod. Ensure your tank is empty of e-liquid before you try to disassemble the tank otherwise you will have e-liquid spilling out.

Zenith II Tank Coil In
Zenith IITank Coil Out

Grasp the main body of the tank and turn the airflow control ring to fully closed. Continue turning to slowly unscrew the knurled bottom section of the tank anti-clockwise until the bottom section of the tank unscrews and comes away from the glass and top section.

The Zenith II Z coils are of a push fit type therefore simply pulling the coil away out of the tank and replace with a new one. Removing the coil is easiest by grasping the threaded 510 connector at the bottom of the coil.

When replacing the coil, ensure the two flat indents on the coil line up with the two indents of the tank so it fully locates into the tank opening. Once the coil is located it shouldn’t turn. If it does then it’s not located therefore carry on turning the coil until it latches in the indents.

Re-connect the base section to the main tank body and carefully screw the two sections together. Make sure you don’t over-tighten but making a firm seal.

Do ensure that your new coil is primed and when filled, left to stand for 15 minutes so the e-liquid fully saturates the wick. See our guide on Prolonging the Life of your Coil.

How do I Charge the Innokin Coolfire Z80 Mod?

Charging the Coolfire Z80 Mod

As with most external battery mods, there are 2 ways which you can charge the battery. Either in the mod itself or using an external charger (recommended).

If you do wish to charge your battery in the mod, the Coolfire Z80 has a bottom front located Type-C USB port.

A Type-C USB charging cable comes supplied with the kit. Simply connect the cable into the USB port on the bottom front of the Coolfire Z80 mod and the other end into a suitable USB power source. The specified charging circuit of the Z80 is 5V/1.7A.

When the Coolfire Z80 mod is charging, it shows the battery icon with a cycling color scale together with a numerical percentage of the battery charge.

Unfortunately, the battery charging display will extinguish (screen goes black) after a few minutes so you don’t know if the battery is still being charged or it’s finished charging.

While this is not an issue, I do feel that it would be far more beneficial to show the battery icons cycling until the charge cycle is complete. Having to press a button to refresh the screen to check if the batteries are still charging is not ideal.

I did leave the Coolfire Z80 mod on charge just to see if the battery icon would show when the batteries became fully charged but unfortunately it didn’t.

A Pass-Through function is included allowing you to charge and vape at the same time.

Charging time from full discharge to fully charged will take approximately 2 hours when using a 5V/1.7A source. This will vary depending on the capacity of the batteries you’re using.

One point worth mentioning, when the Coolfire Z80 is being charged vial the Type-C USB port, the bottom of the mod does get pretty warm. I strongly recommend to ONLY charge the mod on a non-flammable surface.

As with any vape device, NEVER leave your mod unattended whilst charging.

If you prefer to charge your battery externally and I really would recommend doing this, please see our guide on the Best 18650 Battery Chargers.

Innokin Coolfire Z80 Kit Price

Expect to pay around £45 for the Coolfire Z80 kit. For a quality mod with new innovative technology, coupled with a very impressive MTL/RDL tank, buy one, you will NOT be disappointed.

Newvaping are offering it a very good price. Check out the links below to go straight to our recommended sellers.

Innokin Coolfire Z80 Kit Verdict


  • Really good build quality and design
  • Looks and feels impressive
  • Fourier FO and Refresh technology
  • Removable 18650 battery
  • Type-C charging (1.7A)
  • No button rattle
  • Comfortable to hold
  • Easy to use menu structure
  • Great performance from both coils
  • Coils include the 510 thread
  • Very good adjustable airflow for MTL and RDL
  • Zenith II tank very impressive


  • Battery charge icon disappear after a few minutes
  • Bottom of mod gets fairly warm when charging
  • Drip tip needs removing if filling with larger bottles

Innokin Coolfire Z80 Kit Summary

Coolfire Z80 Kit

The Innokin Coolfire Z80 is a really good quality minimalist mod. It doesn’t have modes such as Temperature Control or Variable Power Curve but what it does have it does really well. The Fourier FO and Refresh functions are revolutionary and I’m sure we will see a lot more of this technology in the near future.

A single 18650 battery mod delivering 80W of power in a pretty small lightweight and robustness frame with the proven track record of Innokin’s quality manufacturing process and build quality means this will last for years to come.

Having the ability to fine tune your vaping experience by tweaking the frequency of the applied current to the coil with the Fourier FO technology is a real plus. Equally being able to increase the longevity of a coil by using the Refresh mode can only be a good thing.

The Innokin Zenith II really is a very good MTL/RDL tank. The machining is really good and it feels very solid. Performance from both the supplied coils in the kit was fantastic in terms of flavor and longevity.

Combining the Coolfire Z80 mod with the Zenith II tank is a really good match and definitely complements one another. Both the Coolfire Z80 and the Zenith II are superb in their own right so owning both in a kit form make this really good value for money.

I was expecting good things to come when I started to use and review the Coolfire Z80 kit and I definitely wasn’t disappointed. As I said in the beginning of this review, it’s been a while since I’ve used an Innokin product…a mistake I won’t fall into again.

The Coolfire Z80 kit is a really well designed and really well built combination of mod and tank. Performance is impressive and is one of the best MTL devices out there.

Hope you enjoyed this review on the Innokin Coolfire Z80 kit and found it useful. If you have any questions or feedback, please feel free to leave us a comment below.

Comments 2

  1. Hi,

    First of all, a wreally great review, thank you. But since i´m here, i have an question to ask. Have you found any reason for the z80 to give you up to 80W? The only reason i can think of is that you may change to an different tank and so use different coils. But innokin wont provide you with that kind of coils, since the 0.3ohm coil power succestion maxes out at 40W…

    1. Hi Thomas, thank you for your nice comment about our review, I appreciate it.
      Your right, the coils currently available for the Zenith II don’t fire up to the max wattage the Z80 can provide.
      In a lot of cases, manufacturers will design a mod, especially ones that use an external battery to output this wattage as a high power battery is capable of providing enough current to meet the 80W demand on it.
      Also as you mentioned, because you can use another tank if you wish on the Z80, that tank may have coils that will fire ok at around this wattage. With regards to the Z80, it is possible that Innokin may introduce other coils for the Zenith II that will operate at this wattage in the future.
      I quite often swap tanks and mods around so am glad it does 80W.
      Thank you again Thomas for your comments.

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