Uwell Caliburn G4 Pro Pod Vape Kit

Overview

The Uwell Caliburn G4 Pro Pod Vape Kit by Uwell across 8 flavours at 0mg. Free UK delivery over £20, same-day dispatch on weekday orders before 4pm.

Uwell Caliburn G4 Pro Pod Vape Kit: overview

The Uwell Caliburn G4 Pro Pod Vape Kit is a compact, rechargeable, refillable pod system from one of the longest-running names in small-format vaping. Uwell has built the Caliburn range since 2018 around a simple idea: a slim device that fits in a trouser pocket, fires reliably, and puts flavour ahead of cloud size. The G4 Pro continues that approach with a magnetically seated refillable pod, a USB-C charging port and a coil designed for people who want a fairly tight, cigarette-like draw rather than a wide-open airflow.

This is a kit, not a disposable, and that matters in the UK for two reasons. First, single-use vapes have been banned from sale in Great Britain since 1 June 2025, so a rechargeable and refillable device like this is the format that remains available to most adult smokers who want to switch. Second, because you choose the e-liquid, you control the nicotine strength, the flavour and the running cost, rather than being locked into whatever a sealed, puff-counted device happens to contain.

This page walks through what the kit does well, where it falls short and who it suits. We have tried to be straight about the trade-offs, because a pod kit that works nicely for one vaper is a poor fit for another. The specifications below are the typical figures for this class of device. Always check the packaging in your box, because manufacturers revise components between production runs.

• Format: refillable, rechargeable pod kit
• Pod capacity: 2ml, which is the UK maximum for a refillable pod or tank
• Battery: built-in lithium-ion, in the region of 750 mAh
• Charging: USB-C
• Coil: mesh-style flavour coil, roughly 0.8 to 1.0 ohm
• Draw style: mouth-to-lung (MTL) through to a restricted direct-to-lung feel
• Suggested e-liquid: 50/50 VG/PG nicotine salts, up to the UK limit of 20mg/ml
• Age restriction: 18+ only, with age verification at checkout

What is in the box and how the kit is sold

A Caliburn kit is sold as a complete starter package. In the box you should expect the device itself, a refillable pod (usually already seated in the device, and sometimes with a spare), a USB-C charging cable and the paperwork, which includes a short manual and warranty information. There is no wall plug in the box, so you will need your own USB adapter. A standard phone charger works well.

The listing for this product carries nine options in the same family. For a kit, those options are generally colourways and, in some cases, bundle choices rather than nine separate flavours. The device has no flavour of its own, because you fill the pod yourself with whichever e-liquid you prefer. Use the variant selector on the product page to choose your colour, check that it shows as in stock, and then add it to your basket. If you are buying as a gift, it is worth picking a colour that is easy to spot in a bag, as pod devices are small and easy to mislay.

A few practical points are worth knowing before you order:

• Buy spare pods at the same time. The coil lives inside the pod, so the pod is the consumable part. Having a second one ready means you are never without a working vape when the first one wears out.
• Do not assume cross-compatibility. Uwell has changed its Caliburn pod design between generations. Pods from older Caliburn models may not fit the G4 range, so check the compatibility note on any pod listing before buying.
• Buy e-liquid in 10ml bottles. That is the legal maximum bottle size for nicotine e-liquid in the UK, and one bottle fills a 2ml pod roughly five times.
• Keep your order confirmation. If you ever need to claim under warranty, having the order number and date to hand speeds things up.

The kit is aimed at adults who already smoke or vape. If you do not use nicotine, there is no health benefit to starting, and nicotine is addictive. If you are a smoker looking to switch, the NHS describes vaping as much less harmful than smoking, although it is not risk free, and local stop-smoking services can offer free support alongside a device like this.

Performance and vapour delivery

The Caliburn G4 Pro is built around inhale-to-fire operation, so there is no routine of holding a button down. You draw on the mouthpiece and the coil heats. The airflow is on the tighter side, and the vapour it produces is warm, dense and fairly compact rather than voluminous. If you are coming from cigarettes or a prefilled pod device, the draw will feel familiar. If you are coming from a sub-ohm tank with big open airflow, it will feel restrictive, and that is by design.

In practical terms, performance comes down to three things: how quickly the coil reaches temperature, how consistent the vapour is from the first puff to the last, and how the device behaves when you take back-to-back draws. A mesh coil heats across a wide surface area, so the first draw after a pause is usually sensible and the flavour does not fade drastically as the pod empties. At low power, the device does not generate the kind of heat that makes cheaper pods taste scorched by the end of a fill. Chain vaping is where any small pod gets tested, and you will find that if you take five or six draws in a row, vapour output softens slightly as the wick struggles to keep up. Pausing for a few seconds between draws avoids this.

On puff count, we prefer realism over marketing numbers. A 2ml pod filled with nicotine salt and used at low power will usually give somewhere in the range of 350 to 500 puffs, depending on the length of your draws and how thick the e-liquid is. That is in the same ballpark as the 600-puff figures UK disposables used to claim, which were always optimistic. For a moderate vaper, one pod fill is typically a day to a day and a half. A heavy vaper, particularly someone replacing a pack-a-day habit, may use two or three fills a day.

Throat hit is moderate to firm at 20mg/ml and gentle at 10mg/ml. Nicotine salts are smoother than freebase at the same strength, which is why they suit small low-power pods. If you find the throat hit harsh, lowering the strength or switching to a slightly higher VG blend usually helps more than anything you can change on the device itself.

The device does not ask you to manage settings. That is a strength for people who want something that works on the first day, and a limitation for people who like to tweak wattage and airflow. We cover who that suits, and who it does not, in a later section.

Flavour profile and which e-liquids suit it

Because the kit is refillable, flavour is something you bring to it. What the G4 Pro contributes is a coil and airflow combination that is generally good at rendering the detail in a liquid without muddying it. Tight airflow concentrates flavour on the palate, and a mesh coil heats the liquid evenly, so top notes such as citrus, mint and fresh berry come through cleanly. Dense, sugary dessert liquids can also work, but they tend to shorten coil life, as we explain in the coil section below.

Here are eight flavour profiles that suit this style of device, with a note on how each tends to behave:

• Classic tobacco: the obvious pick for people switching from cigarettes. A light Virginia or a slightly sweeter blend tastes natural at low power and does not gunk the coil quickly.
• Menthol and mint: works well with the tighter draw. Pure menthol gives a clean, cool finish, and spearmint is gentler on the throat.
• Strawberry ice: a dependable all-rounder. The cooling note keeps the sweetness in check, and the flavour stays recognisable throughout the pod.
• Blue raspberry: sharp, slightly sour and easy to identify even at lower strengths. A good choice if you want something that does not taste like tobacco at all.
• Watermelon ice: light and refreshing, with a thin enough body that it rarely clogs the wick.
• Mango: a juicier, rounder profile. Mango liquids that run high on sweetener can darken the coil faster, so go easy on the longest sessions.
• Cola: a nostalgic flavour that translates well to a small mesh pod, with the spice notes coming through clearly.
• Peach and lemon blends: bright, with enough acidity to keep the flavour lively across a whole fill.

A useful rule is to match the liquid to your reason for vaping. If the goal is to stop smoking, tobacco and menthol flavours are the ones most likely to help you stay off cigarettes, although many people find that fruit flavours are what keep them from going back. Use whichever keeps you away from tobacco.

If you want to change flavour, rinse the pod with warm water, let it dry fully, and refill. Better still, dedicate a pod to each flavour family. Strong menthol will linger in a pod and flatten a delicate fruit liquid, so keeping a menthol pod separate saves a lot of disappointment.

Design and build quality

The Caliburn line has always been about slimness, and the G4 Pro follows suit. The body is a rounded rectangle that sits flat in the palm and slides into a jeans pocket without making an obvious bulge. At this size it is closer to a lighter than to a phone, and it weighs little enough that you forget it is there until you need it.

The construction is a mix of alloy and plastic, as is typical for the range, with a finish that varies by colourway. Darker finishes tend to hide fingerprints and scuffs better, while lighter and metallic finishes look sharper when new and show wear sooner if the device lives in a pocket with keys. None of this affects performance, but it is worth considering if you are particular about how your kit looks after a few months.

The pod clicks into place magnetically, with an audible and tactile seat. That makes swapping pods quick and one-handed, and it also means the pod will not rattle loose in a bag. The connection is made through small contacts, so it is sensible to keep them clean and dry. A drop of e-liquid in the contact area is the most common reason a pod stops firing after a refill.

The pod itself has a clear window so you can see the liquid level, a fill port sealed with a silicone bung, and a mouthpiece that is shaped for comfortable lip contact. The mouthpiece is smooth with no hard edges. A small LED indicator near the base lights up when you draw and signals battery or fault conditions through colour and blink patterns, which we list in the troubleshooting section.

The USB-C port sits at the base. That is a practical choice, as USB-C cables are now common in the home, in cars and in most bags, and the port is reversible, so there is no fumbling in the dark. Build tolerances in the Caliburn range have generally been tight, with little rattle and a firm click to the pod, though like all consumer electronics, individual units vary. If you receive something that feels loose or defective, report it promptly with photos so it can be put right.

One honest limitation is that the pod and device are not particularly drop-proof. Treat it like a phone: a case is not necessary, but a pocket without keys helps.

Battery and charging

The G4 Pro uses a built-in lithium-ion battery in the region of 750 mAh. That is a modest figure compared with some rivals, but low-power pod devices do not need a large cell, because they draw relatively little current from it. In everyday use, a light to moderate vaper will usually get through a full day on one charge. A heavy vaper who is replacing a pack-a-day habit should plan to top up once during the day, ideally while the device is not in use.

Charging is over USB-C. Expect a full charge to take in the region of an hour to an hour and a half with a decent 5V adapter. You can use a phone charger, a laptop USB port or a power bank. It is best to avoid fast-charge adapters that are not designed for small devices, and avoid cheap, unbranded adapters in general, because poor-quality chargers are the most common cause of battery problems in vaping devices.

A few safe charging habits make the battery last longer and keep you safe:

• Charge on a hard, non-flammable surface and not on a bed or sofa.
• Do not leave it charging unattended overnight as a matter of habit. Modern devices have protection circuits, but it is a sensible precaution with any lithium cell.
• Unplug once the LED shows a full charge.
• Avoid extreme temperatures. A device left in a hot car or in direct summer sun is at greater risk of damage and leakage.
• Stop using the device if it swells, becomes very hot, or smells of burning. Take it somewhere safe, away from flammable material, and contact us.

The battery is not user replaceable, and it will lose capacity over time. After a year or more of daily use you may find that it goes flat noticeably faster. That is normal lithium behaviour. It is one reason that the whole device has a finite life, and it is worth factoring into the value calculation.

When the device finally reaches the end of its life, do not put it in your household bin or recycling box. Lithium batteries cause fires in refuse lorries and recycling plants. In the UK, you can take old vapes to a household waste recycling centre, to a battery or small electricals drop-off point at many supermarkets and DIY stores, or to a retailer that offers take-back for electrical items. Check your local council's website for the nearest location. Empty pods carry a small coil and no battery, so check your council's guidance on how to dispose of them in your area.

Coil and pod technology

The heart of any pod kit is the coil, and in the Caliburn G4 Pro it is built into the replaceable pod. Uwell's recent Caliburn pods use a mesh-style heating element instead of the traditional wire coil wrapped around cotton. A mesh coil is a thin, perforated metal sheet that touches cotton across a wide area. The practical consequences are faster ramp-up, more even heating and a taste that is less prone to hot spots. Resistance for this type of coil usually falls in the region of 0.8 to 1.0 ohm, which suits the low-power, tight-draw style of vaping.

Uwell markets its flavour-focused coil architecture under a branded name, and in plain terms the idea is to keep temperature stable and avoid overheating the liquid. That is a sensible goal in a small device, because overheating changes the taste of an e-liquid and breaks down some of its sweeteners and flavourings, which is what produces that burnt, bitter taste in a tired pod.

How long does a pod last? With moderate use and a sensible liquid, you can expect somewhere between one and two weeks per pod. Several things shorten that life:

• Very sweet or dessert liquids. Sweeteners caramelise on the mesh and clog the cotton.
• Chain vaping. Draws that are too frequent do not give the wick time to resaturate, so the cotton darkens and burns.
• Underfilling. Running the pod nearly empty before refilling raises the risk of dry hits and burnt cotton.
• High-VG liquids that are too thick. A tight pod with a thick liquid is slow to wick and can starve the coil.

Priming is the single most important step when you fit a new pod or after a refill. Fill the pod to just below the maximum line, tilt the device to avoid the central air tube, then wait at least five to ten minutes before the first draw. This lets the cotton absorb the liquid. Skipping this step is the most common reason a fresh pod tastes burnt on the first few puffs.

It is also worth knowing when to replace a pod. If the flavour turns flat or bitter even after a fresh fill, if vapour production drops, or if the liquid in the pod darkens substantially, the coil is probably spent. Replacing it costs a few pounds and restores the device to as-new performance. Trying to nurse a worn coil along usually means worse flavour and wasted liquid.

Nicotine strength guidance for UK vapers

In the UK, nicotine e-liquid is limited to 20mg/ml (2%), and that cap applies to refill bottles, to prefilled pods and to the disposable devices that used to be sold. Nicotine salts at 20mg/ml are the strongest legal option, and in a small pod kit they deliver nicotine in a way that is closest to a cigarette. You are free to choose lower strengths, and most people will end up somewhere between 5mg and 20mg.

The following is a sensible starting point, though everybody is different:

• Heavy smokers (20 or more cigarettes a day, or smoking within 30 minutes of waking): start at 18mg to 20mg nicotine salt. A lower strength may leave you unsatisfied and reaching for a cigarette.
• Moderate smokers (10 to 15 a day): 10mg to 12mg salt is usually enough, with the option to step up if cravings persist.
• Light or social smokers (fewer than 10 a day): 5mg to 10mg salt, often with 5mg being plenty.
• Current vapers cutting down: step down by small increments, for example from 20mg to 18mg or from 12mg to 10mg, and give yourself a week or two at each stage before moving on.

Salt or freebase? Nicotine salts are smoother at higher strengths, and they are the natural pairing for a tight, low-power pod device. Freebase nicotine is harsher above about 6mg, so very low strength freebase liquids at 3mg or 6mg are mainly used by people who want a looser vape and are close to quitting. The G4 Pro's tight draw is better matched to salts, so a 10mg to 20mg salt is the usual route.

You can tell you are on the wrong strength from your behaviour. If you take more and more draws and still feel unsatisfied, the strength is probably too low. If you feel light-headed, nauseous, or sweaty after a few puffs, or if the throat hit is uncomfortable, it is probably too high. Adjust accordingly.

Do not use more than one nicotine source at a time without thinking about the total. If you use patches or gum alongside vaping, you may need a lower strength of e-liquid. A pharmacist or your local stop-smoking service can help you work out a plan. If you are pregnant, have a heart condition or take regular medication, speak to your GP before switching. Keep nicotine products and e-liquid out of the reach of children and pets.

Who the Caliburn G4 Pro is for, and who should skip it

No pod kit suits everybody, so here is a plain-spoken view of who we think will be happy with this one, and who may be better off looking elsewhere.

It is a good fit if you:

• Are an adult smoker moving away from cigarettes and want a draw that feels familiar.
• Currently use disposable vapes and want a refillable alternative with better running costs and less waste.
• Prefer a small, light device with no settings to fiddle with.
• Value flavour clarity over cloud size.
• Use nicotine salts at 10mg to 20mg strength and are happy with a mouth-to-lung style of draw.
• Want a reliable second device as a backup or a pocket-sized travel option.

You may want to skip it if you:

• Enjoy large clouds and a loose, airy draw. A sub-ohm pod or a small tank kit will suit you better.
• Like to adjust wattage and airflow, because a device with simple controls cannot offer that flexibility.
• Vape heavily throughout the day and dislike having to charge or refill often. A larger battery and a bigger-capacity pod would be more convenient, though UK rules cap tank and pod size at 2ml wherever you shop.
• Mostly use very sweet, thick, high-VG dessert liquids, which tend to starve a tight mesh pod and shorten coil life.
• Have never smoked or vaped. Nicotine is addictive, and there is no benefit to starting.
• Want a throwaway device that you never have to think about. A refillable kit does ask a little more of you, even if the routine becomes second nature within a week.

If you are not sure, think about your habits. Do you want to refill a pod every day or two and keep a spare pod in your bag? Do you mind charging a device nightly? If the answer to both is yes, a kit like this will probably suit you. If those tasks sound like a hassle, a more automated option may be a better starting point, but remember that UK law has removed the single-use choice from shops, so a refillable pod kit is the practical route for most people.

How to set up and use the kit

Setting up a Caliburn G4 Pro takes about ten minutes, most of which is waiting. Follow these steps in order for the cleanest start.

• Step 1, charge the device. Plug it into a USB adapter with the supplied cable and let it charge until the LED indicates it is full. A first full charge is a good habit even if the battery is partly charged out of the box.
• Step 2, remove packaging and protective film. Take off any protective bung, tape or sticker from the pod, including any film on the mouthpiece.
• Step 3, fill the pod. Pull the silicone bung from the fill port, hold the pod upright, and slowly add e-liquid down the side of the port, not into the central air tube. Fill to just below the maximum line, leaving a small air gap. Replace the bung firmly and wipe away any drips.
• Step 4, prime the coil. Wait five to ten minutes with the pod upright so the cotton can soak up the liquid. This is the step most beginners skip, and it is the most common cause of burnt first puffs.
• Step 5, seat the pod. Press the pod into the device until the magnet clicks. Check that the contacts are dry.
• Step 6, take a gentle first draw. Inhale slowly and evenly for two to three seconds. The LED should light on each draw. Take a couple of short test puffs before you settle into a normal pattern.
• Step 7, refill before it runs dry. When the liquid reaches the bottom of the window, refill. Running a pod fully dry is the quickest way to burn a coil.

For daily use, a few habits help. Keep the device upright when you are not using it, so liquid does not seep towards the contacts. Wipe the mouthpiece and the contact area with a dry tissue now and then. Do not tilt the pod while filling in a way that floods the air tube. Travel with the pod empty, or at least with the bung firmly seated, because changes in air pressure on a plane or on a mountain road can push liquid out. A small zip bag is a good idea for any device that will sit in a bag with other items.

The 18+ rule is not just a legal formality. Keep your kit, spare pods and e-liquid away from children, and store e-liquid in its original bottle with the child-resistant cap.

Troubleshooting common problems

Most problems with pod kits have simple causes. Before you assume the device is faulty, run through the following checks.

• The device does not fire. Check the pod is fully seated and the contacts are clean and dry. Wipe them with a dry cotton bud. Confirm the battery has charge by plugging it in. If the LED flashes when you draw but nothing happens, try a different pod to rule out a spent coil.
• Burnt or dry taste. This usually means the coil is not getting enough liquid. Refill the pod, wait at least ten minutes, and take slower, shorter draws. If the taste persists with fresh liquid, the coil has probably reached the end of its life, and the pod should be replaced.
• Leaking. The usual causes are overfilling, an unseated bung, a hairline crack in the pod, or pressure changes. Wipe the pod and contacts, refill to a lower level, and press the bung firmly in. If a pod leaks repeatedly, replace it. Never keep using a leaking pod, because the liquid can reach the battery contacts.
• Gurgling or spitting. Condensation has gathered in the air path. Blow gently back through the mouthpiece, or wipe the mouthpiece clean, and the problem should clear.
• Weak vapour. Check the battery, the liquid level and the thickness of the e-liquid. Very thick high-VG liquids struggle in tight pods. A 50/50 blend is a safer choice.
• Blinking LED. Different blink patterns indicate low battery, a short circuit or a coil fault. Check the manual in your box for the patterns on your unit. A short-circuit indication often clears after cleaning the contacts and reseating the pod.
• Device will not charge. Try a different cable and adapter. Check the USB-C port for pocket lint, and clear it gently with a wooden toothpick. Do not use metal tools.
• Pod will not come out. Pull straight out and avoid twisting. If the magnet feels stiff, check the pod base for dried e-liquid, which can act as glue.
• Sticky residue. Dried e-liquid around the pod and device is harmless but unpleasant. Wipe it with a slightly damp cloth, and dry the device thoroughly before reassembling.

Never try to open the battery compartment or modify the device. If you suspect a genuine fault, such as a swollen casing, excessive heat or a persistent charging problem, stop using it and get in touch. Include your order number, a short description and clear photos or a video, and we can advise on the next step.

Value for money and how it compares with rivals

The real cost of vaping is the running cost after the kit, so it helps to look at the maths. A 10ml bottle of nicotine salt e-liquid typically costs a few pounds and fills a 2ml pod around five times. Pods themselves cost a few pounds each and last for one to two weeks. For a moderate vaper, that tends to add up to a modest weekly spend. Compare that with a pack of 20 cigarettes, which now costs well over fifteen pounds, and the saving is significant, often several hundred pounds a month for a heavy smoker. Compared with disposables, a refillable kit is cheaper per day once you have covered the up-front cost, and it produces less waste.

Where the value is weaker is for people who do not want to refill or replace pods. If you are the kind of person who loses small devices, a cheaper kit may suit you better. If you are likely to use the device daily for a year, the cost per week of the hardware becomes small.

Here is how the G4 Pro sits against some well-known alternatives. We have tried to be fair, because each has strengths.

• Vaporesso XROS series: a popular direct competitor with a similar form factor, often a slightly larger battery and, on some models, adjustable airflow. It is a strong option if you want a little more control. The Caliburn tends to appeal more if you want a simple, tight draw and a neat flavour.
• SMOK Novo series: a long-standing range with a wide supply of pods and a lower price point on many models. The pod choice is broad, and it is easy to find in shops. Flavour quality is solid, though many vapers find the Caliburn's mesh pods a bit more refined.
• Voopoo Vmate range: generally good value and slim, with a gentle draw that suits beginners. Battery and pod options vary by model, so compare the specific version you are considering.
• Geekvape Wenax range: a durable, practical option with a long track record, and a good pick for people who are rough on their kit.
• OXVA Xlim range: a well-regarded option with adjustable airflow on several versions, suited to people who like to fine-tune.

In short, the Caliburn G4 Pro is competitively priced for what it offers: a compact build, a clean flavour and a simple operating routine. It does not try to be the most feature-rich option, and if adjustable airflow or a bigger battery matters to you, one of the alternatives above may be a better match. If a small, easy-to-use kit with a tight draw is what you want, it is a sensible choice.