Review-Ehpro Cold Steel 100 TC Box Mod 120W

Ehpro has done some good things over the last few years, I’ve used their Mod 101 as a daily driver, and their real MTL RTA is one of the most impressive mainstream mouth-to-RTAs I’ve ever used. Now they’re back to the Ehpro Cold Steel 100, designed by Us By YouTube critic AmbitionZ Vaper.

Ehpro Cold Steel 100 vape mod review

What we can get from Ehpro’s Cold Steel 100

The Cold Steel 100 is an adjustable single-battery module that requires 21700, 20700 and 18650. Somewhat confusingly, this is actually a 120W device, despite being called the Cold Steel 100.

Ehpro Cold Steel 100 SHAPE

I suspect the name has been decided when they asked For Z to enter it because one of the things he has said he wants to change is that it wants to reach 120W instead of the 100W they planned. So a huge small single-battery mod, capable of 120W (with the right battery).

So let’s see what we get! This item was sent free of charge for this review. As always, this will never change my point of view, and I will honestly report my findings.

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In the box

  • Cold Steel 100 mod
  • 18650 Adapter (inside the mod)
  • Belt loop holster
  • USB Cable
  • Manual
  • Battery Safety Sheet
  • Warranty Card
  • QC Card

Ehpro Cold Steel Specs

  • 27.5mm x 39 x 91.5mm
  • 177g (mod only)
  • Resistance Range 0.05Ω – 3.0Ω
  • Wattage 5-120W
  • Micro USB Charging/Firmware Upgrade
  • Power / Temp / Curves / Volt / Bypass
  • 21700, 20700, 18650


  • Short Circuit
  • Reverse Battery
  • Over Heat
  • 10s Cut-Off
  • Over Current
  • Low Voltage
  • Weak Battery
  • Battery Overcharge

Design and Build Quality

When you choose the Cold Steel 100, you will immediately notice its weight, which is not plastic too great!

The entire product is made of metal (brass, zinc alloy, and stainless steel) and it has a reassuring weight, especially once you fit the 21700 and tank. It comes in three colors, grey champagne (I have), black obsidian or old gold. Grey champagne has a lovely vertical lying surface that feels very smooth and doesn’t touch fingerprints.

Colour options for the Cold Steel 100 mod

However, since its color is slightly warmer, it does not match most accessories perfectly, although it is close enough to the pulley steel. AmbitionZ Vaper prints over the fire button.

With the base of the cold steel embossed module.


The only other print is on the 510 plate, which says it is made by Ehpro and your serial number. The design will allow SXmini’s SL Class to take some people into account.

But I don’t think they’ve lost any meaning for it. When you design a single battery module, you have to find a place where the board and switch are placed.


It either turns into a small box mod, or you want to keep the tube style, you make it higher (my Ehpro Mod 101 Pro is another 26mm height) or stick to its own part on its side. There are also some thoughtful contacts, and the tube part has a slight hourglass shape, so it fits the hand very comfortably.

In addition, all corners of the control section are rounded, so despite the heavy weight, it is still very comfortable. The width (excluding bumps) is 27.5mm, but the top is tilted towards the spring mount 510, meaning that this will handle up to 25mm without any overhang.

mount 510

Ehpro Cold Steel Screen

The OLED screen is a bit small, measuring 4mm x 18mm, but because of this and the fact that it is embedded in the metal, you have to really have to break it. It is also very good and bright, and I read it in the bright sun and never encounterany trouble.

This is certainly some of their previous mod improvement areas! When you turn it on, the word Cold Steel scrolls on the display, which is good. However, when you turn it off instead of just turning it off and even saying “goodbye”, it’s actually “goodbye” and I can’t stop hearing childish singing!


A little bit but here hope ehpro will allow us to change it in the future with a firmware upgrade!

Ehpro Cold Steel Controls

You have a nicely textured fire button, and your +/- on what looks like a rocker switch.

  • 5 Clicks = On/Off
  • 3 Clicks = Menu, +/- to scroll and Fire to select
  • Fire and + = Lock your value (wattage, voltage or temp)
  • Fire and – = Flip-screen orientation
  • Fire, + and – = “Stealth Mode” Screen off, and values locked

Underneath, you have a small hole with LED (it flashes green when you screw the battery) and your micro USB port for charging and firmware upgrades.

As usual, I would never recommend charging the battery on my device, just using an external charger. The battery cover has absolute silky threading, + and – shows your battery direction clearly printed inside. When you first get the mod, your 18650 adapters will be here, and I’m happy to say that even the smaller battery doesn’t have a click.

Belt Loop Holster

When you first open the box, the mod is in this nice, durable belt pocket, the simple Ehpro brand is white.

Belt Loop Holster

However, while I love its inclusion, I can’t see that I’ve ever used it because it doesn’t provide any way to turn it off when you connect to Atty. The top folds down and is kept closed by the magic paste, but does not have enough height to connect and close anything.

Belt Loop Holster

I did manage to turn it off with one of my smallest RDAs. . . but I hope there’s a way to make it work when you’re filling the tank.


There are many modes to meet almost anything you need. It’s not obvious when you first use it, but there’s actually a lower-level menu behind some options. The menu system is well designed to stack menu options reasonably to take advantage of the small screen.


Once you’ve selected Power, you can choose Normal, Soft or Strong, each with a slightly different acceleration time to suit your style. For a single click, the power will be adjusted to 30W (0.5W, 30-120W) in increments of 0.1W, and will be fully adjusted to 1W if held down. If you hold it down, it scrolls quickly.

Stop at the top or bottom and cycle.

I think this is one of the best adjustments I’ve ever encountered, allowing you to easily switch power while giving you full fine control. One thing to note is that you can’t get 120W from 18650, although it still lets you scroll up to that high. Ehpro actually says on its website that 80-120W can only be reached with a 40A battery.


In temperature control mode, the first wire type must be selected:

  • Nickel
  • Titanium
  • Stainless
  • TCR for entering your own value

Then set the power you want it to power immediately, and if you set up your own TCR, you can do so after this step. I love this, it’s integrated into the setup control because sometimes you need to dig deeper into other menus.

In addition, it allows you to use the full 120W module in the TC, so many modules limit you when you switch to temporary control and do not allow you to reach the maximum.

When complete, you can scroll from 200-600 degrees F and then stop, which will cycle from 100-315 degrees C to Celsius. When you select a temperature control, it also locks the resistor, which is a useful touch.

I’ve found the TC on a mod that doesn’t (or require another menu step), and if you turn it back on after a period of time, your resistance reading will change because of the resistance change. Just remember to always set the temperature control when the coil is at room temperature.

Curve body

The curve allows you to change the way the ignition is ignited in increments of 0.1s and allows the power to multiply by 0.5x and 2x. For most people this may be a bit grainy, except for playing it fast, it’s not my return mode.

It’s good, but I suspect most people will be happy with the Soft/Normal/Strong option in power mode.

But be aware that to exit the curve, you have to press and hold the fire button, so if it is set to use 2 times the power (and your coil is already in high wattage), you risk blasting it bit! You can read more about the power curve here.

Voltage and Bypass

These all do what you want, honestly I don’t know a lot of people still use voltage compared to watts, but if you like it will be there. Bypasses give you the feel of mechanical mode with all the regulated protection.

How does the Ehpro Cold Steel 100 work?

Battery Life

I’ve been using 21700 except for a few quick tests. This is my main device for a while and I’ve been happy with it and I’ve thrown everything in it with composure.

battery options for cold steel 100 mod

For the first few days, I was testing it at lower wattage’s (15-25W) for Mouth to Lung (MTL) vaping and the battery seems to last forever, happily giving me 2-3 days of heavy vaping.

One thing I did notice though is that it does seem to drain them VERY dry, so I’d recommend taking your batteries out before the mod won’t fire anymore.

Stepping up to a dual coil Direct to Lung (DTL) tank, vaping at 70-100W the battery life obviously took a big hit, but it would still last me half a day quite easily. Their power management has definitely been improved here.

One nice thing about replacing your atomizer with a new one is that (provided it’s turned on when you do it) it will ask you if it’s a new coil or the same, which you select with +/-. If you select New, it will take a guess (based on resistance) of what wattage you’re likely to be wanting.

If you select Same, it will keep your wattage unchanged. A small thing, but appreciated!

Temp Control

I set up a drip pertinent with a TC wire, and I don’t often use vape in TC, but it seems to do very well to throttle power and provide consistent vape.

It also never reached the point where it dried me up.

One thing to keep in mind when you use Temp Control is that you want to set a higher watt than usual because you only set the maximum value it will use, and it will soon drop the coil to heat up. Combined with TC’s thoughtful menu features, I was very impressed with the way it was performed and recommended it for those curious about trying TC, but it was delayed by the chaotic implementation.


It’s worth noting that the launch is very fast in the bypass.

It does feel like using a mechanical module when you press a button, you hit it instantly and the power drops when the battery runs out. If you’re interested in getting into mechs, then things like this in bypass mode will give you some exercise and feeling without risking life and limb.


  • Rugged quality and perfect surface
  • 120W single battery module
  • A menu really carefully designed
  • Temperature control doesn’t look like an afterthought. Fast ignition in bypass mode


  • Rolling tiles can be a bit too fast.
  • Calling “Bye-Bye” is like playing children’s TV.
  • Instead of pressing and pressing fire, you can use the Settings feature when setting a curve
  • Slightly meaningless (albeit pretty) belt bag Champagne ash doesn’t quite match.

Ehpro Cold Steel Final review

You might say I’m very impressed with the Ehpro Cold Steel 100 mod.

The built quality and well-designed menu system make this one of my favorite single-battery modules.

It has a reassuring weight and feels like you’re unfortunate to drop it and the floor will get worse.

While it certainly reminds people of another improved version there, it’s not enough to stand on its own two feet. Although my Cons list is as big as my professionals, they are small and trivial, and they don’t take much away from those great toolkits.

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