Innokin Coolfire IV Plus 70W iSub G Full Kit review

The Innokin Coolfire IV Plus is an improved version of Innokin’s very successful Coolfire IV 40W. Its successor boasts a wattage output almost twice as high and has received several other upgrades, most notably to the battery, while only being slightly bigger. The Coolfire IV Plus full kit is currently listed at a price of $64.99 and for now is only available as a bundle. We tested this mod for you to see if the upgrades are worth paying for.

Innokin Coolfire IV Plus 70W iSub G specs and build quality

Featuring an improved wattage output firing at up to 70W at atomizer resistances of as low as 0.1 Ohm it is significantly more powerful than the original Coolfire IV and supports most sub-ohm tanks. Voltage is adjustable at a range of 2V to 7.5V. The battery has been upgraded to 3300 mAh and has an incredibly long lifetime. Unfortunately, the Coolfire IV Plus offers no temperature control mode. One thing we didn’t like about the original Coolfire IV was the rather small display and we are happy to report Innokin has installed a big and bright, well organized display in the Coolfire IV Plus.

The chassis of brushed aluminum is very sturdy and elegant. This mod is slightly thicker than the original one in order to make room for the upgraded battery, but we actually didn’t mind because this makes it sit even nicer in your hand. The full kit comes with Innokin’s iSub G tank included, a very solid tank of highest build quality using stainless steel and pyrex glass. This sub-ohm tank comes with Innokin’s easy coil swap system, meaning you can swap coils at any time without spilling your precious juice.



: 66mm x 22mm (with drip tip)


: Built-in 3300mAh


: Metal case with a durable finish

Output voltage

: VV 2 - 7.5 Volt


: 6-70W

Available coils

: Set comes with 2 0.5 Ohm coils


: Wattage

Tank capacity

: 4.5ml


: 510

Innokin Coolfire IV Plus 70W iSub G vapor production and flavour

Testing this kit in action we experienced a very clear and defined flavour right from the first puff. The iSub G sub-ohm tank is a great unit for lower wattage devices such as the Coolfire IV Plus and you can produce a good amount of vapor at a wattage as low as 25W. We did find this atty was going through our e-liquid quicker than other clearomizers so the high vapor production comes at a price. Overall we were satisfied with the performance of this kit, especially at a lower wattage output, but we weren’t quite blown away by it. You might get better results with other atomizers.

  • Very easy to use
  • Long battery lifetime
  • High quality building material
  • Nice Design
  • Good battery capacity

  • No temperature control mode
  • Uses more e-liquid than your average atomizer
  • High price tag

Innokin’s original Coolfire IV has been very popular with beginners and intermediate vapers because it was very straight-forward and easy to use. With the new Coolfire IV Plus the performance has much improved while retaining the same no-fuss attitude. The most notable changes include a much better battery lifetime and a bigger, brighter display which we were very glad to see. With temperature control being as popular as it is these days it may be a bit disappointing for some of you that this is missing in this mod. The iSub G sub-ohm tank is very well built and produces a pleasant flavour right from the start but unfortunately the whole setup swallows a lot of e-liquid. The tank complements the Coolfire IV very well in terms of ease of use.

6.1 Total Score
Very Good!

Overall Performance
Vapor Production
Ease of use
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