Uwell Caliburn G4 Review

Uwell just debuted the latest in the Caliburn vape series: the Uwell Caliburn G4. Featuring a 1300mAh battery and a customisable UI with adjustable wattage and power modes, this Caliburn is definitely a step up. Let’s take a closer look at the device and its specs!

The latest iteration in the Caliburn series has landed in all its hotly anticipated glory: the Uwell Caliburn G4. The all-new device houses a decent-sized 1300mAh battery and a nifty little screen with a customisable UI, adjustable wattage, and two power modes to choose from. 

Uwell was kind enough to send over samples of the new device for us to review. So, let’s dive in! 

Uwell Caliburn G4 Overview

The Uwell Caliburn G4 was released alongside the Caliburn G4 Mini as the latest iterations in the world-renowned Uwell Caliburn vapes series. For those who don’t know, the original Caliburn is considered the world’s first commercial pod vape and was hugely popular even years after its release.

Since then, the Caliburn series has continued to expand and innovate, and while the G4 name makes it sound like only the 4th iteration in the series, there have been well over a dozen models in the Caliburn series thus far. 

So, when Uwell sent these samples over for us to test, I just knew I needed to try it. I’ve owned a few Caliburns in my time—the most memorable being the Caliburn Pro and G3 models—so I was really excited to try the next gen device.

Whenever a new Caliburn debuts, I often find that Uwell took some of customers’ feedback on board while ignoring some important complaints raised with previous models. This time around, I had a very similar experience, though I do think the improvements outweigh most of my qualms.

Let’s get into it!

Design and Appearance

The Uwell Caliburn G4 is a sturdy little device made primarily of a thick and durable plastic material. The shell feels nice and thick, which is perfect for me given how clumsy I am. I opted for the Glacier Blue finish.

The front of the device houses the 0.85” HD colour screen with a metallic frame set into a pearlescent plate (which will vary depending on which finish you choose). At the top of the plate, you’ll find the G4 logo.

The flip side of the device is made of a solid plastic emblazoned with the Caliburn logo. You’ll find the E-Liquid sight window at the top. More on this later.

One side of the device features the adjustable airflow switch alongside the Uwell logo, the battery capacity, and the legal icons. The other side of the device houses the function/fire button beside the USB type-C charging port (and, in my case, a “sample not for sale” stamp).

The bottom of the device is rounded and has 2 bottom airflow holes.

I really like the feel of this device, though it does look a bit cheap. I guess that’s the price of sturdiness. However, there are a couple of flaws in the Caliburn G4’s design.

My biggest qualm is with the E-Liquid sight window. Once again, Uwell has failed here. It’s small, and since the hole is only on one side (and the mouthpiece is black), no light can get in—so you can hardly see into it to refill or check your current E-Liquid level. 

It’s a poor excuse for a “sight window,” and Uwell has gotten this feedback before on previous Caliburns, which is why I think this is a huge miss. They could’ve learned from past mistakes. 

It’s designed so you can refill the pod without removing it—but how can I do that if I can barely see inside?

The screen is also a huge fingerprint magnet, which I noticed as soon as I unboxed it. Rather than looking clean and ritzy, it looks dull and cheap. The screen is blurry half of the time.

In addition, the button on the side of the device sticks out ever-so-slightly from the rest of the body, which may not seem like an issue—until a stranger comes up to you on the train platform to tell you your bag is smoking and you find that it’s been firing on its own, spewing hot vape juice on your wallet and AirPods, and leaving behind a burnt chemical smell that’ll only come out with a professional clean (speaking from personal experience, of course). 

I wouldn’t trust this vape in my pocket or bag if there’s a chance it could get pressed up against something else and misfire.

Last on my list of flaws is the rounded bottom, which prevents upright storage. This may seem like a small flaw—and it is, honestly—but the best way to store a vape when it’s not in use is upright to prevent E-Liquid leakage. 

Overall, it’s a pretty sturdy vape that looks nice but has a few design flaws. 

Interface and Features

The Caliburn G4 features a nifty little screen, a fire/function button, and adjustable airflow to help you tailor the vape to suit your needs. You can choose between “Storm” and “Waves” power modes—with Storm providing a stronger hit while Waves gives a smoother, more levelled vape. 

The airflow adjustment is nice and sturdy, offering everything from a loose RDTL to a standard MTL draw when fully closed. I’m currently using the 0.4Ω pod with the airflow fully closed, which creates a nice MTL draw—not super tight, but not too loose.

I’ve got some notes on the interface, so strap in!

0.85” HD Colour Screen

The Uwell Caliburn G4 houses an 0.85” HD colour screen, complete with retro animations reminiscent of old video games. The “C” in the Caliburn logo looks awfully similar to Pac-Man. It’s really neat, though I do wonder if all these animations drain the battery.

You can opt to turn the animations off by selecting the simple theme from the menu.

The menu is fairly simple to use—press the button 4 times to open it, and select from the options. You can choose your theme, swap between day and night modes, and clear your puff counter. 

As a side note, this is the first vape I’ve seen with day and night brightness modes, allowing you to dim the screen for low-light conditions (or crank it up for direct sunlight).

The menu will display your current battery level (measured in 5% increments), your current pod resistance, your wattage, your puff count, and the length of your last puff. Do I really need to know how long my last puff was? Not really. But I digress.

While I take issue with the blurriness of the screen (because of its aforementioned propensity for accumulating fingerprints), the menu itself is fairly intuitive and easy to use. I’ve had no issues with operation thus far.

Fire/Function Button

The button on the side of the device serves as a fire button and function button, so you can either fire the device by pressing it (but who does that nowadays?), or change the menu settings using various choreographed button presses.

My issue with the button is that while it does offer a lock feature, this only prevents button firing. This means that if the vape is in your pocket or handbag and it presses up against something else—say, 4 times consecutively—the settings will change without you realising.

I don’t understand why, in 2025, a vape like this even needs button-firing, since the majority of vapers who use the button to fire their vape are sub-ohm vapers who won’t be using this device in the first place. 

I love when a vape’s button can be locked, but if locking doesn’t prevent accidental setting changes, then what’s the point?

This is one of those vapes that I won’t trust in my pocket or bag. Who knows what it’ll get up to when I’m not looking. 

Battery Life and Performance

It’s nice to see Uwell producing vapes with a larger battery now; I’ll never forget the pricey Caliburn Pro, which had a measly 850mAh battery and cost nearly £40. 

Thankfully, the Caliburn G4 has a decent-sized 1300mAh battery, though I do think it’s a bit overstated. It doesn’t last quite as long as some of the other vapes I’ve used with a similar battery size.

With that being said, the vape offers 2A fast-charging, which is nice for quick recharges. It takes just over half an hour to recharge from 0% to full battery.

I have no qualms with the battery in this device—especially given the battery sizes in earlier Caliburn devices. Thank goodness Uwell took this criticism on board!

Uwell Caliburn GPP Pods

The Uwell Caliburn G4 uses the same pods as the previous generation of devices: the GPP platform, or Caliburn G3 pods. The vape comes included with a 0.9Ω pod for MTL vaping and a 0.4Ω pod for RDTL vaping. 

Both pod resistances are compatible with the same E-Liquids—50% VG/50% PG blends, like nic salts and freebase 10ml juices— but you’ll likely find that the 0.9Ω pod delivers less vapour and uses less power while the 0.4Ω pod is heavier on the clouds (and your battery life). There are also 0.6Ω and 1.2Ω options available separately.

Generally, I prefer the 0.4Ω pods because I’m flavour-hungry. I love the big clouds and the punchy hit of a low-resistance coil.

I’ve reviewed these pods before, but suffice to say, I’m definitely on board—though I’m not a huge fan of the fill port.

They have a snap-off clamshell mouthpiece, which can be a bit difficult to remove the first few times you refill, but it’s incredibly sturdy. 

Whereas the mouthpiece on the pods I normally use in my everyday vape (Vaporesso XROS pods) tend to crack before the coil dies, causing leakage and requiring premature replacement, the Caliburn G3 pods' mouthpieces are super strong. You won’t have that problem with the G3 pods. 

I’ve also noticed that these pods are really good at preventing leakage compared to a number of other vape pods I’ve used.

With that being said, the refill system on this vape is a little tedious. When you fill the pod, you have to press the nib of your E-Liquid bottle down, activating a spring mechanism which allows you to refill the pod. It’s irritating for someone like me with weak hands and carpal tunnel to have to push down while squeezing the bottle—plus, the nibs on my favourite E-Liquid bottles (Bar Juice 5000) are long, slender, and flexible, which isn’t conducive to this refill port.

Refilling takes a few seconds longer than it does in any other pod I’ve used because of this, but it’s designed to prevent leakage, which it does brilliantly. I guess the takeaway is that there's a cost to a leak-proof pod, and that’s an irritating refill port.

Still, the pods taste great and last just as long as my usual pods—roughly 2 weeks—before losing their flavour, so if irritating refills are my only complaint, that’s a great sign.

Vaping the Uwell Caliburn G4

The Uwell Caliburn G4 is an absolute delight to vape. Once you’ve got your power mode set—and your button locked, in my case—simply puff on the mouthpiece and the vape will do the rest. 

I love the form factor and how it feels in my hand, and the vapour production is spot on. The pods taste clean and the coils work really well, and overall, I don’t have anything negative to say about the way the vape works in the field.

Who should get the Uwell Caliburn G4?

The Caliburn G4 is ideal for MTL and RDTL vapers looking for a cool new vape with customisable features, minus the adjustable wattage. For fans of the Caliburn series, this vape will satisfy every requirement. 

It offers enough hand-holding for beginners and enough customisation to satisfy experienced vapers, too, so I wouldn’t say you should buy this vape based on your experience level. It has a little something for everyone.

The only cohort this vape wouldn’t fit, obviously, is sub-ohm vapers, since the kit isn’t compatible with cloud-heavy high-VG E-Liquids.

Uwell Caliburn G4 Accessibility

As always, I like to cover accessibility in my reviews due to the sheer number of smokers converting to vaping. If you’ve got a vision impairment or dexterity issues like arthritis, this section is for you.

Unfortunately, the Uwell Caliburn G4 fails the accessibility test. Both the screen and the E-Liquid level are hard to see, and I sincerely can’t imagine anyone with a vision impairment being able to use this vape. 

In addition, because of how small the button is and how the refill port works, I wouldn’t recommend this vape to anyone with dexterity issues. I simply don’t think this vape will work for you.

If you’re looking for a more accessible vape, I highly recommend you check out our other article: Top 5 Easy To Use Vapes. The article is written with elderly smokers in mind, but its major focus is accessibility.

Conclusion

The Uwell Caliburn G4 has been an absolute pleasure to review. Thanks again to Uwell for sending us samples of the device to test—I'm always happy to give my feedback!

And while I had some qualms with the device’s design and interface, the vape is genuinely extremely sturdy and durable, perfect for clumsy vapers like me! For the value, it’s a really solid, customisable vape, perfect for Caliburn devotees.

As always, if you need help finding the right device for you, we’re always on hand to answer questions and offer personalised advice. Contact us via email or live chat for expert advice.