Innokin Coolfire Z80 Box Mod Kit & Zenith II Kit, a necessary throwback after testing the NEX version last July and particularly appreciating it. This is an 18650 box mod kit (Coolfire Z80) paired with a strictly MTL - tight RDL atomizer (Zenith II) utilizing the Z Coils that Innokin still produces and remain easily available due to high demand. Kit provided free of charge by HealthCabin for review purposes; no compensation or business relationship involved.
The package is generous with accessories alongside the two main protagonists: the Coolfire Z80 and Zenith II. Included are a second sealed drip tip, a set of O-rings, two Z Coils (0.3 and 0.8 ohm), a USB Type-C cable, a replacement glass tank, a user manual, and a warranty card.
Innokin Zenith II, constructed from 304 stainless steel, measuring 51.7 x 26 mm with a 5 ml capacity. Standard 510 connection for any drip tip. No screw-off top cap; instead, a twist-to-fill system reveals the silicone seal, compatible even with wide-nozzle chubby bottles.
The "exploded view" shows the top cap/refill section with the 5.5 ml glass installed, which fits into the central block with the steel cage to protect the pyrex and house the Z Coils. Finally, the threaded base plate keeps everything secured.
The airflow ring is positioned at the bottom. As is often the case, I find bottom-airflow tanks like the Zenith II more aromatically satisfying than top-airflow versions, offering a draw that feels much closer to an RTA.
Z Coil installation remains simple and immediate, with the coil base serving as the contact pin. Coils must be inserted by aligning them with the notches in the housing. Always check for the black O-ring near the bottom threading of the coil; it acts as both an insulator and a seal for the Zenith II.
Z Coils continue to be produced years after their release. All are made of Kanthal and compatible with most tanks in this line:
0.3Ω RDL Coil: 30 - 40W (Included)
1.0Ω RDL Coil: 20 - 25W
0.8Ω Coil: 14 - 17W (Included)
0.48Ω Plex 3D Mesh: 12 - 16W
0.5Ω Plexus Coil (Mesh): 12 - 16W
1.6Ω Coil: 10 - 14W
0.6Ω Duoprime Coil: 9 - 13W
1.2Ω Coil: 9 - 13W
Despite the 0.3Ω option, the Zenith is structurally much closer to a pure MTL tank. The 0.8Ω coil gives a great impression of what it can offer in MTL mode, outperforming competitors and even top-airflow Zeniths like the NEX. Flavor on the Zenith II is significantly more defined and full-bodied despite its age.
Coolfire Z80, given the scarcity of 18650 boxes on the market, it’s best to play it safe with a mod that offers minimal dimensions (83.5 x 38 x 28 mm) and a solid zinc alloy build.
The 510 threading is well-executed, with a notch on the plate to prevent atomizers from sitting completely flush, allowing those that take air from the pin to be mounted without issues. It accommodates atomizers up to Ø 26 mm without any overhang.
The steel battery cap for the single 18650 has the positive pole facing up and a flip-handle to assist unscrewing. There are 4 venting holes provided for safety, but be careful when placing it on wet surfaces.
My unit (Black) features a faux-leather wrap with a great hand-feel and a slight rough texture for better grip. For other colors, it's closer to standard fabric. The front face houses the fire button, accented in gold/orange. The color screen is a Ø 0.96 inch display with good visibility.
A hallmark of this circuit is the Refresh mode, a coil "cleaning" feature using frequencies to prevent gunk buildup, ensuring the coil wears out evenly. It actually works, especially visible when using drippers or RTAs.
The Coolfire stays in a permanent standby state; pressing the fire button once wakes the screen with a prompt that 3 clicks are required to turn it on.
and - buttons to access the menu
Fire and + buttons for the battery status shortcut and puff reset menu
FØ - to activate and adjust the Hertz for the refresh mode
Power - choice between wattage and voltage
Refresh - "manual" refresh with the option for an automatic cycle or "hold to run"
Settings:
Op. Screen - toggle display of resistance and puff counter on the home screen
Timeout - adjust screen timeout
Cutoff - adjust puff cutoff time
Device ID - chipset info
Reset - factory reset
It's increasingly rare to see MTL kits with removable batteries. The Coolfire is a solid box even for those (like me) who use mostly RTAs, allowing for compact dimensions without being forced into pod mods. The refresh mode is an extra feature that is definitely worth a try. The Zenith II remains one of the few bottom-airflow MTL tanks that consistently delivers superior flavor, with a capacity that covers an entire workday and a structure that protects the tank from impacts.
Innokin Coolfire Z80 Box Mod Kit with Zenith II Tank Atomizer is available at HealthCabin at the following link
https://www.healthcabin.net/innokin-coolfire-z80-box-mod-with-zenith-ii-tank-p/26833.html
As of Monday, February 23rd, the New Year holidays have ended and HealthCabin is fully operational again. I would like to thank
HealthCabin for the kit and the community and staff of
e-cigarette forum for providing me the space to share my thoughts