UK review / refillable pod kit / nic salt focused
Uwell Caliburn G4 Pro review: a flavour-first pod kit with more control than most beginner devices

The Uwell Caliburn G4 Pro Vape Kit is a refillable pod vape built for people who want stronger flavour control, better battery stamina, and cleaner day-to-day handling than a throwaway device can offer. This review covers what the specs actually mean in use, which e-liquids and pod resistances suit it, what it costs to run against disposables, and how it compares with the Vaporesso XROS 4 and OXVA XLIM SQ Pro 2.

Reviewed by Vapebus Editorial Updated Verdict 4.6 / 5 Price at review £21.99 18+ only · contains nicotine
Important reader note: the Uwell Caliburn G4 Pro is a refillable pod kit, not a prefilled flavour device. That means flavour quality depends on pod resistance, wattage, airflow, and the liquid you pair with it. Some aspects such as flavor, weight, and design are subjective and should be evaluated personally.
Data sourced from official product specifications

Primary spec references: Uwell official product page, plus independent UK retailer cross-checks. Prices and stock were accurate at the time of writing.

Quick specification snapshot

Battery
1800mAh
Integrated battery
Output
Up to 35W
Smart / Waves / Storm / Custom
Pod volume
2ml
TPD-compliant UK format
Screen
2.51 in
Touchscreen UI
Weight
79g
Listed by Vapebus
Dimensions
120 × 30 × 19mm
Vapebus listing
Pod family
GPP / G3
0.4Ω to 1.2Ω ecosystem
Charging
USB-C
5V/2.5A shown on UK retailer listing

Product overview

The Uwell Caliburn G4 Pro Vape Kit is best understood as a refillable pod kit for people who are done with one-note disposable convenience but still do not want the size, maintenance, or menu clutter of a full box mod. The engineering pitch is simple: an 1800mAh battery, up to 35W, a 2.51-inch screen, stepless airflow, and broad pod compatibility from tighter MTL to warmer RDL. The commercial pitch is even simpler — it gives you more control than a beginner kit without turning everyday vaping into homework.

That middle ground is the whole reason this kit sells. Most people arriving here are choosing between three things: staying on disposables now that they are banned in their old form, buying the simplest possible refillable pod, or spending more on something with a proper interface. The G4 Pro is the third option without the box-mod tax.

Specifications verified against the Uwell official product page.

Uwell Caliburn G4 Pro Vape Kit shown upright with pod fitted
120mm tall, with a 2.51-inch touchscreen and USB-C on the base.

Product parameters, accurately stated

The cleanest way to read this kit is to separate hard data from marketing language. Hard data first: an integrated 1800mAh battery, output up to 35W, a 2ml pod in TPD markets, support for both MTL and RDL styles, USB-C charging, and compatibility with the Caliburn GPP / G3 pod ecosystem. The official page highlights the touchscreen, airflow adjustment, and mode system; UK retailer pages confirm the 2ml TPD format and the 5V/2.5A fast-charging figure. Working weight is listed at 79g, with dimensions of 120mm high, 30mm wide, and 19mm deep.

That places it above the typical “inhale and forget” pod kit on control, but still below full-mod complexity on upkeep. The specs map cleanly to real usage rather than to a spec-sheet arms race.

SpecificationConfirmed figureWhy it matters in real use
Battery capacity1800mAhLarge for a slim pod kit; one of the biggest reasons the Uwell Caliburn G4 Pro stands out against smaller backups.
Maximum output35WEnough range to make 0.4Ω and 0.6Ω pods feel meaningfully warmer than typical beginner-only MTL devices.
Pod capacity2mlRequired for TPD compliance in the UK; means refilling is normal and not a product flaw.
Screen2.51-inch touchscreenUseful if you actually change wattage or modes; unnecessary only if you never adjust anything.
CompatibilityCaliburn GPP / G3 podsUseful for both nicotine salt MTL setups and warmer 50/50 RDL use.
ChargingUSB-C / 5V-2.5A retailer listingHelps the Uwell Caliburn G4 Pro feel practical rather than precious for work-break carry.
Weight79gNot ultra-light, but still pocketable and more reassuring in hand than hollow-feeling plastic minis.

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Sources: Uwell official specifications, cross-checked against UK retailer listings at two independent UK retailers. Figures retrieved at time of writing and may change.

Which pod resistance should you actually buy?

This is the single decision that determines whether you enjoy the kit or end up posting a complaint about burnt taste. The G4 Pro accepts the Caliburn GPP and G3 pod range, and the resistance you choose has to match your nicotine strength, your liquid, and the draw you want. Pick wrong and the device gets blamed for a pairing error.

Pod resistanceDraw styleSuggested powerNicotine strengthWho it suits
1.2Ω
Tight MTL — closest to a cigarette 10–13W 20mg nic salt Recent switchers and anyone who wants the longest battery life and the least liquid use.
0.9Ω
Standard MTL 12–16W 10–20mg nic salt The safest all-round starting point. If you are unsure, start here.
0.6Ω
Loose MTL / light restricted lung 16–22W 5–10mg nic salt Users who want warmer vapour and more flavour volume without going full RDL.
0.4Ω
Restricted direct lung (RDL) 22–30W 3–6mg, or 50/50 freebase Experienced users chasing vapour and warmth. Expect the shortest battery and pod life.

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The one rule that prevents most problems: as resistance goes down, nicotine strength must come down with it. A 20mg nic salt in a 0.4Ω pod at 28W is genuinely unpleasant and is the most common self-inflicted mistake in pod vaping.

Flavour system: what this kit can actually do

Because this is a refillable kit rather than a flavour-locked disposable, the right question is not “how many flavours does it come in?” but “which flavour families does it reproduce best?” That distinction matters more than it sounds.

UK market data from ASH shows fruit remains the dominant preference at 60%, followed by menthol or mint at 15% and tobacco at 9%, with “ice” variants appearing across multiple families. The G4 Pro lines up with that demand well because its pod range covers both crisp MTL nic salt delivery and fuller low-ohm 50/50 use. In practical terms: fruit, berry-lemonade drink profiles, mint, menthol, and balanced dessert blends all work here. Thick 70/30 shortfills do not — they will wick poorly and dull the flavour. Think profile-matching, not flavour-count theatrics.

Fruit / Berry / Ice

Best match for the Uwell Caliburn G4 Pro if you want bright top notes, stronger perceived sweetness, and easy all-day rotation.

fruitberryicesweet_mediumbeginner_friendly

Good examples sold on Vapebus: Watermelon Ice Nic Salt by Elux and Pink Lemonade Nic Salt by Bar Juice.

Fresh / Mint / Menthol

Best if you want a clean exhale, lower palate fatigue, and a calmer step away from harsh disposables or cigarettes.

freshmintsweet_lowice_strongcommute_safe

Examples: Fresh Mint Nic Salt by Dinner Lady and Ice Menthol Nic Salt by Vampire Vape.

Dessert / Creamy fruit

Works, but only if wattage stays sensible; dessert flavours become muddy faster than mint or straight fruit if you push them too hard.

dessertfruitsweet_highice_nonehome_use

Example: Unicorn Nic Salt by Dr Vapes, a strawberry-milkshake style nic salt.

Flavour preference figures: ASH 2026 factsheet on e-cigarette use among adults in Great Britain.

Every flavour category, and which profiles sell best

Flavour categoryHow the Uwell Caliburn G4 Pro handles itSweetnessIce levelUK demand fit
FruitUsually the strongest match; clear on 0.8Ω to 1.2Ω with nic salts and still lively on 0.6Ω.Low to highOptionalVery strong
Drink / SodaSharp lemonade and berry-soda profiles read well because the device preserves high notes without crushing them.Medium to highOptionalStrong
Fresh / MintExcellent for ex-smokers, work breaks, and longer use; cooling cuts fatigue better than candy profiles.LowMedium to strongStrong
DessertWorks best at calmer power; too much heat flattens cream and bakery detail faster than fruit.Medium to highNoneModerate
TobaccoBest on higher-resistance pods with tighter airflow, especially for smokers who want cleaner structure over sweetness.LowNoneNiche but important

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The strongest best-seller logic here is not novelty; it is controlled familiarity. Pink lemonade works because berry sweetness and fizzy citrus are both easy to read through a small pod system. Watermelon ice works because a sweet inhale and cold exhale stay distinct even at high nicotine strength. Fresh mint works because the profile is stable, low-fatigue, and forgiving for new users. Unicorn-style creamy fruit delivers sweetness and body, but it is less universally safe than fruit-ice or mint in a compact pod. Blue razz lemonade remains popular across the UK market generally, though for all-day use in this kit, straight fruit, fruit-ice, and clean mint still rank ahead of candy-heavy blends.

How to set it up properly the first time

This kit is not difficult to use, but it rewards correct setup far more than a sealed prefilled device does. Five minutes of care on day one prevents almost every complaint people later post about pod vapes.

  1. Fill correctly. Open the fill port, insert the nozzle, and fill slowly to about 90% — leave a small air gap. Overfilling is the number one cause of gurgling and leaking.
  2. Prime and wait. Fit the pod and leave it standing for 5–10 minutes before the first puff. This lets the cotton saturate fully. Skipping this step is how new coils get scorched on puff one.
  3. Take two priming puffs with no power. Draw on it without firing to pull liquid into the coil.
  4. Start in Smart Mode or at the low end of the pod's range, then work upward. Never start at 35W.
  5. Set airflow last. Begin nearly closed for MTL and open it gradually. Adjusting airflow changes perceived flavour and throat hit as much as wattage does.

As a rule: 0.9Ω and 1.2Ω are calmer for higher-strength nic salts and tighter MTL; 0.6Ω is the middle lane; 0.4Ω is for users who genuinely want a warmer, airier restricted draw. The kit is flexible, but flexibility only helps when the pod, liquid, and wattage are not fighting each other.

Uwell Caliburn G4 Pro pod and fill port detail
Fill to roughly 90% and leave an air gap — overfilling causes most gurgling and leaking reports.
Uwell Caliburn G4 Pro touchscreen and airflow control
Set wattage on the touchscreen first, then fine-tune the airflow slider — in that order.

Performance review

Reduced to one line: better flavour control than a simple beginner pod, without the housekeeping penalty of a larger device.

Notably, Uwell does not sell this on an inflated puff-count number — which is the right call, because honest pod-kit evaluation should focus on how consistently a device delivers your chosen liquid across different pod resistances. On that measure it performs well. Throat hit is smooth with 10mg to 20mg nic salts on higher resistances. Coil behaviour is most convincing when the wattage matches the pod rather than the user's ambition. Hand feel is solid enough to read as premium without becoming heavy. Stability benefits from a pod system that supports a practical range rather than forcing one style, and value is strongest for people buying a device to keep rather than a gimmick to replace.

Flavour, weight, and design are partly subjective — treat the readings below as a starting point and judge them against your own preferences.

Review factorEditorial readingHow to judge itMain caveat
Claimed vapour vs real vapourNo inflated puff-count framing; output depends on pod choice and liquid.Compare 0.4Ω, 0.6Ω, 0.9Ω and 1.2Ω behaviour rather than expecting one universal draw.More wattage always costs battery life.
Throat hitBest with 10mg-20mg nic salts on tighter pods.Judge with airflow mostly closed and sensible power first.Wrong liquid ratio ruins the result faster than the device does.
Coil performanceMesh format should favour flavour clarity and everyday consistency.Look for flavour fade, spitback, and flooding rather than one dramatic puff.Chain use on lower-ohm pods accelerates decline.
Hand feel / materials79g is still portable but more substantial than ultra-light minis.Check grip, screen fingerprints, and pocket comfort.Some users still prefer the lighter XROS approach.
Sweetness handlingFruit and soda flavours should read clearly; dessert needs restraint.Try one clean mint and one sweet profile for contrast.Overpowering sweet liquids mask nuance.
PortabilityStrong for commuting, work breaks, and backup-carry roles.Compare it with a cigarette packet, keys, or slim wallet in pocket.Not the smallest pod kit in class.

Design and build quality

This kit does not win on flash; it wins because the design choices serve the category it occupies. At 79g it is light enough for everyday carry but heavy enough to feel less toy-like than many micro pods. The 2.51-inch screen is the obvious talking point, yet the more important detail is that the interface removes button-combination guesswork. A device positioned between disposable alternatives and enthusiast hardware should make adjustment faster, not slower, and this one mostly follows that rule.

Material feel is credible — the body does not read as bargain-bin plastic, and the shape is pocket-safe rather than ornamental. The obvious caveats are fingerprint visibility and the low-level worry about accidental screen taps in a pocket. Both are small prices for a genuinely readable control surface. See the wider mesh pod range for replacement options.

Why it fits the UK market right now

This kit lands neatly in a market that has become more serious about reusable systems. Government guidance confirms the single-use vape ban took effect on 1 June 2025, while reusable devices remain legal when they use a rechargeable battery, a refillable container, and a replaceable coil or pod system.

Meanwhile, ONS reported that in 2024 current e-cigarette use in Great Britain reached 10.0% and overtook current smoking at 9.1% for the first time. ASH's 2026 factsheet adds that 42% of adult vapers use pod devices and that fruit remains the leading flavour preference. That is precisely the backdrop in which this device makes sense: a legal, TPD-compliant, refillable pod kit that aligns with nic salt use, flavour-led buying, and the shift away from single-use convenience.

Sources: GOV.UK single-use vapes ban guidance · ONS adult smoking habits 2024 · ASH 2026

Expert score and user sentiment

Expert score
4.6/5
Flavor
9.2
Vapor
8.4
Throat hit
8.8
Build quality
9.0
Consistency
8.7
Value
8.6

Editorial rating here is a comparative equipment score, not a health endorsement.

User snapshot
4.7/5

A major UK retailer listing showed 4.7 out of 5 from 126 customer reviews at the time we checked — slightly higher than our editorial read. Community comments circle back to the same three points: very good flavour, genuinely useful battery size, and a screen that feels practical rather than gimmicky next to older multi-click pod interfaces. That gap, where owners rate a device a touch higher than reviewers do, is common when the product solves everyday friction well.

Owner rating retrieved from a UK retailer listing at time of writing; review counts change over time.

Practical reading: experts are usually stricter on value and technical caveats; owners often reward the device for simply making daily vaping easier.

Five reasons to buy it

Reason 1

Best refillable upgrade from disposables

The Uwell Caliburn G4 Pro offers the rechargeable battery, refillable pod format, and replaceable pod logic that UK regulation now pushes users toward.

Reason 2

Best pod kit for flavour and nic salts

The pod range and power headroom make the Uwell Caliburn G4 Pro suitable for tighter MTL nic salt setups and warmer mid-power use.

Reason 3

More control without full-mod complexity

This is the rare device where more settings do not automatically mean more faff, especially if Smart Mode is your default.

Reason 4

Longer-session battery logic

1800mAh is materially stronger than the 1000mAh class, which matters if your use pattern is frequent but not dramatic.

Reason 5

Better long-term economics than single-use buying

The hardware spend is front-loaded, but refillable use with replaceable pods and 10ml liquids is structurally cheaper than repeat disposable buying.

Find your match: four reader profiles

Rather than one generic recommendation, here are four common setups. Find the profile closest to your taste, cooling preference, and where you vape most, then use the pairing below it as a starting point.

Profile A — Fruit / balanced / beginner / commuting

FruitBerryIce lightSweetness mediumBalancedNew userCommuting
  • 1. Uwell Caliburn G4 Pro Vape Kit — stable MTL setup for 10mg or 20mg nic salts.
  • 2. Watermelon Ice Nic Salt by Elux — sweet inhale, cool exhale, easy step from disposables.
  • 3. Pink Lemonade Nic Salt by Bar Juice — fizzy citrus-berry balance with good all-day appeal.
  • 4. Vaporesso XROS 4 Vape Kit — simpler alternative if you want fewer controls.

Profile B — Fresh / mint / low sweetness / ex-smoker

FreshMintIce strongSweetness lowLight to balancedBeginnerWork breaks
  • 1. Uwell Caliburn G4 Pro Vape Kit — 0.9Ω or 1.2Ω makes the most sense here.
  • 2. Fresh Mint Nic Salt by Dinner Lady — clean, simple, low-clutter palate profile.
  • 3. Ice Menthol Nic Salt by Vampire Vape — stronger cooling for smokers who want clarity.
  • 4. Vaporesso XROS 4 Mini Vape Kit — backup option if you want the lightest carry.

Profile C — Dessert / no ice / richer body / home use

DessertSweetness highNo iceStrongNot-first-timerHome use
  • 1. Uwell Caliburn G4 Pro Vape Kit — keep power conservative to preserve creamy notes.
  • 2. Unicorn Nic Salt by Dr Vapes — strawberry milkshake style with fuller body.
  • 3. OXVA XLIM SQ Pro 2 Pod Vape Kit — stronger battery and premium feel if you tweak often.

Profile D — mixed flavour / tangy / social use / trying something new

DrinkCitrusBerryIce optionalNovelty yesSocial
  • 1. Uwell Caliburn G4 Pro Vape Kit — gives enough control to separate layered notes.
  • 2. Pink Lemonade Nic Salt by Bar Juice — clean two-note crossover.
  • 3. Watermelon Ice Nic Salt by Elux — fruit-forward fallback if lemonade feels too sharp.
  • 4. Lost Mary BM6000 Pods – Blue Razz Lemonade — candy-leaning alternative if you prefer prefilled style.

Setup advice that prevents most complaints

This kit rewards sensible matching far more than aggressive tweaking. If your goal is smooth nicotine delivery, cleaner throat hit, and less coil frustration, pair it with a nic salt e-liquid or another 50/50 blend, keep resistance at 0.8Ω or above, and run airflow on the tighter side. If your goal is more warmth and vapour, step down to 0.6Ω or 0.4Ω and lower the nicotine strength before raising the wattage.

That sounds basic, but it is the core reality of pod systems: most “bad device” complaints are actually wrong-pod, wrong-liquid, or wrong-power complaints. This kit is built to give you options, not to protect you from every mismatch. For the safest everyday setup, start conservatively and widen airflow or power only once the baseline flavour and wicking feel settled.

Caliburn G4 Pro vs XROS 4 vs XLIM SQ Pro 2

These three kits answer slightly different versions of the same question. Against the Vaporesso XROS 4, you are asking whether better flavour control and a bigger battery justify extra interface complexity. Against the OXVA XLIM SQ Pro 2, you are really choosing between the Uwell pod feel and the OXVA ecosystem with its more premium dashboard.

The XROS 4 stays simpler and lighter at 53g with a 1000mAh battery, making it the easier beginner recommendation. The XLIM SQ Pro 2 pushes further into premium territory with 1600mAh and a larger touch interface. The G4 Pro sits between them: more capable than the XROS 4, less desk-bound in spirit than the OXVA.

DevicePriceBatteryMax powerWeightInterfaceWhy pick it
Uwell Caliburn G4 Pro
Our pick
£21.991800mAh35W79g2.51in touchscreen Best balance of flavour ambition, control, and pod flexibility. The middle option that does not feel like a compromise.
Vaporesso XROS 4 £17.991000mAh18W53gSimple / button Cleanest simplicity and the lightest carry. The easiest recommendation for a straight switch from disposables.
OXVA XLIM SQ Pro 2 £25.991600mAh30W~70gLarge touchscreen Premium interface and richer data layer. Best if you enjoy adjusting settings frequently.

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Choose the G4 Pro if…

You want the longest battery of the three, both MTL and RDL in one device, and real control without a learning curve.

Choose the XROS 4 if…

Budget and pocket weight matter most, you never intend to adjust wattage, and you want the simplest possible refillable.

Choose the XLIM SQ Pro 2 if…

You actively enjoy the interface, want the most premium finish, and do not mind paying £4 more for it.

Rival specifications cross-checked against UK retailer listings at time of writing. Prices are subject to change.

What it actually costs to run

This is the calculation most reviews skip, and it is the strongest practical argument for a refillable kit. The hardware spend is front-loaded; after that your running cost is liquid and occasional replacement pods rather than a whole new device every few days. Below is a like-for-like estimate for a moderate user, based on £21.99 hardware, £3.99 per 10ml nic salt, and roughly £5.50 per replacement pod.

Disposables
£84

per month, at roughly 3 devices a week

Hardware£0
~13 devices @ £5.99–6.50~£84
Month one total£84
Caliburn G4 Pro — month 1
£45

including the one-off hardware purchase

Kit£21.99
4 × 10ml nic salt£15.96
1–2 replacement pods~£7
Month one total~£45
Caliburn G4 Pro — ongoing
£23

per month once the kit is bought

Hardware£0
4 × 10ml nic salt£15.96
1–2 replacement pods~£7
Monthly total~£23
Read this as an illustration, not a promise. Real cost depends entirely on how much you vape, which resistance you run, and how long your pods last — a 0.4Ω pod at 28W will burn through both liquid and pods considerably faster than a 1.2Ω pod at 12W. The direction of the saving is reliable even when the exact figures are not: the break-even point against disposables typically arrives inside the first month.

Buying advice by daily demand

This is not the cheapest entry point, but it is one of the more rational ones at £21.99, with compatible nic salts at £3.99 per 10ml. If you currently smoke or are moving off disposables, the useful question is not where to find it cheapest but which setup keeps you satisfied without overspending or overcomplicating your day. Match your current habit to one of the three cards below.

The guidance below uses a behavioural rule of thumb — people tend to reach for a vape more often than a cigarette — to suggest nicotine strength and pod resistance. It is a shopping aid, not medical advice or a laboratory measurement. If you are using vaping to stop smoking, NHS Better Health and your local stop-smoking service can give tailored support.
Uwell Caliburn G4 Pro Vape Kit
Uwell Caliburn G4 Pro Vape Kit
£21.99

Best for medium to high daily demand, nic salts, and users who want more control than a basic pod.

1800mAh35WMTL/RDL

View product

Vaporesso XROS 4 Vape Kit
Vaporesso XROS 4 Vape Kit
£17.99

Better if you want a simpler day-to-day carry and still want a solid flavour-first pod system.

1000mAhFast charge53g

View product

OXVA XLIM SQ Pro 2 Pod Vape Kit
OXVA XLIM SQ Pro 2 Pod Vape Kit
£25.99

Best for users who want a premium interface, large battery, and richer analytics than most pod kits offer.

1600mAhTouchscreen0.6/0.8 included

View product

Light demand

Around 5 cigarettes a day means a light but frequent pod habit. This kit works, but the XROS 4 or XROS 4 Mini may feel more economical.

1.2Ω pod10mg salt10–12W

Medium demand

Around 10 cigarettes a day points to a 10mg or 20mg nic salt with a tighter pod and moderate airflow. This is the sweet spot for the G4 Pro.

0.9Ω pod20mg salt13–16W

Heavier demand

15–20 a day is where the 1800mAh battery and pod flexibility look materially stronger than any 1000mAh mini.

0.6–0.9Ω20mg salt16–20W

Troubleshooting: five faults and their real causes

Almost every problem reported with pod kits traces back to a handful of causes, and in most cases the device is working exactly as designed. Here is how to diagnose each one before assuming a fault.

SymptomMost likely causeHow to fix it
Burnt taste Coil fired before the cotton fully saturated, or wattage set above the pod's range. On a new pod, wait 5–10 minutes after filling. Reduce wattage a few watts. If it tastes burnt from puff one and never recovers, the coil is already dead — replace it. Chain-vaping a low-ohm pod is the usual culprit.
Gurgling / spitback Flooded coil, usually from overfilling or drawing too hard. Remove the pod, tap it mouthpiece-down onto a tissue to clear excess liquid, then take slower, gentler draws. Fill to 90%, not the brim.
Leaking Usually condensation rather than a true leak. Sometimes a poorly seated pod or a loose fill plug. Wipe the pod contacts and device bay dry, check the fill plug is fully closed, and reseat the pod. Large pressure or temperature changes — flights, hot cars — make this worse.
Weak flavour Coil nearing end of life, airflow too open, or wattage too low for the resistance. Close the airflow slightly and raise power a couple of watts. If flavour faded gradually over 1–2 weeks, the pod is simply worn out. Heavily sweetened liquids shorten coil life noticeably.
Not firing Dirty contacts, a flat battery, or the device is locked. Clean the pod and device contacts with a dry cotton bud, charge over USB-C, and check the device is not in lock mode. Try a second pod to isolate whether the fault is the pod or the device.

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If a device fails to charge, becomes hot, or shows physical battery damage, stop using it and contact your retailer. Do not attempt a repair on a sealed integrated battery.

Maintenance guide

This kit is not demanding, but maintenance discipline decides whether it still feels premium after week one. Use the right liquid ratio, avoid overfilling, keep the pod seated cleanly, wipe condensation before it becomes a “leak” story, and do not push sweet liquids past the pod's comfortable power range. Recharge over USB-C before the battery is repeatedly flattened, and replace pods when flavour drops or the draw turns rough rather than trying to squeeze impossible life out of them.

A realistic pod lifespan here is one to two weeks on higher resistances with unsweetened liquid, and noticeably less on 0.4Ω with heavily sweetened juice. That is normal consumable behaviour, not a defect.

Health note: most e-liquids contain nicotine, which is addictive, and use propylene glycol and vegetable glycerol as carriers. NHS guidance is clear that while vaping is substantially less harmful than smoking, it is not harmless, and that children and people who have never smoked should not vape. Read the NHS guidance on vaping to quit smoking.

How we assessed it

This review blends official specification data, UK retailer cross-checks, flavour-market context, and aggregated owner feedback. It is not a laboratory report and does not pretend to be one — no puff counts were measured in controlled conditions.

The assessment models five common use profiles rather than one imaginary “perfect user”: beginner switcher, moderate commuter, heavier all-day user, mint-focused ex-smoker, and flavour-chasing experienced pod user. It also weights three ownership phases that matter in practice — early setup confidence, daily-use stability, and pod and battery behaviour once the novelty has worn off. Where a judgement is subjective, such as hand feel or flavour preference, that is stated rather than presented as measurement.

Pros and cons

Pros

  • Excellent flavour potential for a slim pod system
  • 1800mAh battery is genuinely useful
  • Touchscreen control is practical, not decorative
  • Broad pod compatibility for MTL and RDL
  • Strong fit as a legal reusable alternative in the UK

Cons

  • 2ml TPD pod means frequent refills are normal
  • Fingerprint-prone screen for some users
  • Dessert liquids need more careful wattage restraint
  • Not the lightest pod kit in pocket
  • No honest fixed puff-count value model, because refillable use varies

Frequently asked questions

Is the Caliburn G4 Pro good for beginners switching from disposables?

Yes, especially if you want a proper step up rather than the absolute simplest device. Smart Mode, refillable pods, and a large battery make it a strong disposable alternative. If you genuinely never want to adjust a setting, a simpler kit like the XROS 4 will suit you better.

What e-liquid works best in it?

A 50/50 PG/VG ratio, and specifically nic salt e-liquid for higher-resistance MTL pods. Thick 70/30 shortfills are a poor match — they wick too slowly for these pods and will dull the flavour or cause dry hits.

How long does the battery last?

Battery life depends on pod resistance and power, but 1800mAh is strong for this size class and will comfortably see most moderate users through a full day. Tight MTL use at 12W lasts substantially longer than warm 0.4Ω use at 28W — potentially double.

What pods fit the Caliburn G4 Pro?

It uses the Caliburn GPP and G3 pod range, spanning roughly 0.4Ω to 1.2Ω. That shared ecosystem is a practical advantage, since pods are widely stocked and you can switch draw style by swapping a pod rather than buying another device.

Is it legal in the UK?

Yes. It meets the UK reusable-vape criteria — rechargeable battery, refillable container, and replaceable pod — and uses TPD-compliant 2ml pods. The single-use vape ban that took effect on 1 June 2025 does not affect compliant refillable kits. GOV.UK guidance

Does it leak?

Any pod system can misbehave if overfilled, flooded, or paired with the wrong liquid. Most reported “leaks” in this class are condensation around the pod contacts. Fill to about 90%, close the plug fully, seat the pod properly, and wipe the bay occasionally.

Why does my pod taste burnt?

Nearly always because the coil fired before the cotton fully saturated, or because wattage exceeded the pod's range. Wait 5–10 minutes after filling a new pod and start at the low end of the power range. Once a coil is genuinely scorched it cannot be recovered and must be replaced.

How often do I need to replace pods?

Expect one to two weeks per pod on higher resistances with unsweetened liquid, and less on 0.4Ω or with heavily sweetened juice. Replace when flavour noticeably drops or the draw turns harsh rather than trying to extend it.

Is it worth it compared with the XROS 4 or OXVA XLIM?

If you want the broadest mix of flavour capability, battery size, and accessible controls, yes. Choose the XROS 4 if lightness and simplicity matter more, or the XLIM SQ Pro 2 if you want the most premium interface and will actually use it.

Final verdict

The Caliburn G4 Pro is one of the more believable “advanced but still everyday” pod kits in the UK market. It earns that by doing a few important things well: real control that does not demand study, genuine flavour quality when paired with the right liquid, and enough battery to make the device dependable rather than delicate.

It is not perfect and should not be sold as perfect. The 2ml pod format means refilling is part of life, dessert liquids need wattage restraint, and no touchscreen will rescue a bad pairing of liquid, pod, and power. But if your priorities are upgrading properly from disposables, getting the most out of nic salts, and having more control than a beginner kit without full-mod complexity, this remains a strong and realistic recommendation.

Best for
Switchers who want control
Skip if
You want the lightest carry
Our score
4.6 / 5

Flavour perception, hand feel, and long-session comfort remain partly subjective, so compare widely and try for yourself where you can. View the Uwell Caliburn G4 Pro Vape Kit →

Health note: nicotine is addictive; vaping is not risk-free; e-liquids typically use propylene glycol and vegetable glycerol as carrier ingredients; children and non-smokers should never vape. NHS