The Uwell Caliburn G4 is the latest entry in Uwellβs renowned Caliburn series β a compact pod vape that aims to set a new standard for flavor and performance in 2025. Since its release, it has quickly become a standout in the crowded pod market, earning praise as a powerful yet portable device that doesnβt compromise on performanceβ. In this comprehensive review, weβll analyze every aspect of the Caliburn G4: its appearance and design, functionality and features, performance and flavor quality, user experience, durability, and cost-effectiveness. Weβll also compare the Caliburn G4 vs. Caliburn G4 Mini and Caliburn G4 vs. Caliburn G3 to see how Uwellβs newest pod system stacks up against its siblings. By the end, youβll know if the Caliburn G4 truly earns a spot among the best pod vape 2025 contenders.
Appearance and Design
Uwell has retained its signature minimalism with the Caliburn G4βs design, while giving it a modern makeover. The device features a smooth aluminum-alloy body with rounded edges and subtle ridged texturing for a secure gripβ. Weighing in at around 48 g, it feels lightweight yet solid in the handβ. The G4 stands approximately 115 mm tall and is slender enough to slip comfortably into a pocketβ. Users can choose from a variety of vibrant color finishes β Uwell offers up to eight different colors, from classic black and grey to pastel blue and pink β each with a ceramic or metallic sheen that adds a touch of sophisticationβ.
One of the most eye-catching design elements is the 0.85-inch HD color display embedded on the front. This thumb-sized screen blends into the deviceβs body and displays animated themes along with useful info like battery level, wattage, coil resistance, and puff countβ. The inclusion of a screen makes the G4 feel more advanced and interactive than previous Caliburn models. By contrast, its smaller sibling β the Caliburn G4 Mini β forgoes a screen entirely in favor of a simple LED light strip for battery feedbackβ. The G4 Miniβs minimalist approach keeps it super sleek, but the full-size G4βs display will appeal to those who like having real-time data and customizable visuals at a glance.
Despite the added tech, the Caliburn G4 remains ultra-portable and ergonomic. It has slightly larger dimensions than the Mini (114.9Γ26Γ15.6 mm for the G4 vs. 112.7Γ24.1Γ14 mm for the Mini)β, but both devices are compact and pocket-friendly. The G4βs smooth corners and slim profile make it comfortable to hold, whether youβre an MTL vaper βpinchingβ it between your fingers or simply gripping it in your palmβ. Overall, Uwell has balanced style and practicality β the G4 looks modern and βyouthfulβ with its vibrant finishesβ, yet it doesnβt feel flashy or flimsy. Build quality is solid, and the chassisβ subtle texture helps hide smudges and minor wear from daily use. From an appearance perspective, the Caliburn G4 certainly feasts the eyes without sacrificing the classic simplicity that Caliburn fans loveβ.
Features and Functionality
The Caliburn G4 packs a surprising amount of technology and user-friendly features into its slim frame. Starting with the basics, it is a refillable pod system designed for both MTL pod device enthusiasts and those who enjoy a slightly looser draw. It uses replaceable Caliburn GPP pods (Global Pod Platform) which snap into the top of the device. Each pod cartridge holds 3 ml of e-liquid (standard version)β, providing a generous capacity for a pod vape. Uwell improved the pods with its latest PRO-FOCS 4.0 flavor technology, which not only boosts flavor but also extends coil lifespan by about 35% compared to previous gen cartridgesβ. The G4 is actually compatible with both the new G4 GPP pods and the older Caliburn G3 pods, so users upgrading from a G3 can reuse their existing pods if desiredβ. This cross-compatibility is a thoughtful touch that offers convenience and cost savings.
Refilling the Caliburn G4 is quick and mess-free. The pods feature a side-fill system: just remove the pod (though Uwell notes you donβt even need to fully remove it on the upgraded podsβ), open the silicone plug on the side, and fill with your e-liquid. The clear-view juice window on the device lets you easily monitor your liquid level at a glanceβ, so you wonβt be caught off-guard with a dry pod. The G4βs pod design emphasizes leak prevention β thanks to Uwellβs UΒ² technology, which uses ultrasonic welding and a U-shaped airflow channel, the new pods are highly leak-resistantβ. the G4βs pods remain virtually leak-proof and condensation-free, even when carried in a pocket all dayβ. This addresses a common annoyance in pod vapes (leaking) without any need for a βCaliburn G4 leaking fixβ β the engineering largely prevents leaks from occurring in the first place.
Another standout feature is the adjustable airflow control. Unusually, the Caliburn G4 gives you three ways to fine-tune airflow to your preference.
- A slider valve on the side of the device lets you gradually open or restrict the airflow intakeβ.
- You can also adjust by simply inserting the pod in different orientations (180Β° rotated) β a classic Caliburn trick to toggle between a tighter or looser drawβ.
- For maximum customization, you can combine the two methods above (set the slider and flip the pod) to really dial in the perfect drawβ.
This multi-point airflow control means the G4 can cater to a spectrum of vaping styles, from a tight mouth-to-lung pull similar to a cigarette, up to a restricted direct-lung inhale. Whether you prefer a βcigarette-likeβ MTL draw or an airier hit, the G4 has you coveredβ. In our testing, we found that with the airflow mostly closed and using the higher-resistance pod, the G4 delivers a satisfyingly tight MTL draw ideal for high-strength nic salts. Opening the airflow wide and using the lower-resistance pod gives a looser draw with more vapor β not an open DL cloud-chucking experience, but a comfortable RDL (restricted direct lung) hit that many pod vapers enjoy. This level of versatility is rarely seen in ultra-portable pod kits.
The firing mechanism on the Caliburn G4 is dual-activated. You can vape simply by inhaling (auto draw), or use the small button on the body to fire manually. The fire button doubles as the deviceβs power and settings button, but Uwell kept the interface very simple. Five clicks turn the device on/off, and a quick double or triple-click (in combination with on-screen prompts) lets you switch modes or toggle through menu optionsβ. Importantly, there are no complex menus to scroll through β Uwell knows a pod device should be easy. In fact, if you never want to bother with modes or settings, you can just ignore the button and use it like a typical draw-activated Caliburn; it will deliver a consistent output automatically suited to the pod. But for those who like more control, the Caliburn G4 introduces adjustable wattage and unique vape modes, which weβll cover next.
Screen, Power, and Vaping Modes
The inclusion of a full-color screen on the Caliburn G4 is a major leap for the Caliburn line. The 0.85β³ TFT display isnβt just for show β it provides useful functionality:
- Wattage Adjustment: The G4 offers a 5β35 W output rangeβ. It can automatically adjust power to suit the pod (for instance, it might run around 18 W on the 0.9Ξ© pod or 25 W on the 0.6Ξ© pod), but you can also manually select your preferred wattage using the button and screen interface. This makes the G4 more like a mini vape mod in terms of control, allowing you to fine-tune warmth and throat hit.
- Dynamic Theme UI: Uwell loaded the screen with two sets of animated themes (a playful touch rarely seen in pods). You can choose different color themes or even a Day/Night mode for the displayβ. The screen shows attractive graphics (Uwell calls it a βcarefully designed theme UIββ), making the device feel a bit more personal. While themes are mostly aesthetic, the novelty adds to the fun factor of using the G4.
- Info Display: Key data is shown clearly β including battery percentage, coil resistance, output wattage, and a puff counterβ. Having a puff counter and resistance reading on a pod is quite advanced; it helps users track usage and ensures the device is recognizing the pod correctly.
- Storm Mode & Waves Mode: Exclusive to the Caliburn G4 (the Mini does not have this), these two vaping modes tailor the power delivery for different experiences. Storm Mode hits hard and fast β it ramps up power quickly for an intense, impactful draw (Uwell likens it to the thrill of a roller coaster ride)β. In practice, Storm Mode gives a stronger initial burst of vapor to satisfy cravings βin a split secondββ, which is great when you need a quick, punchy nicotine hit. Waves Mode, on the other hand, smooths out the power delivery for a gentler, more consistent draw from start to finish β βlike riding the London Eyeβ where you can savor each momentβ. In Waves mode, the G4 feels more like a steady output pod system, prioritizing flavor and a mellow inhale. Switching between Storm and Waves is simple (a quick button sequence). These modes are a unique addition that let you customize your vaping experience beyond just airflow and wattage. For most users, Waves mode will be the daily go-to for its smoothness, while Storm mode can provide an extra kick when desired.
Despite the advanced capabilities, the user experience remains straightforward. The screen interface uses intuitive icons and the single button for control, so it doesnβt overwhelm the user. Uwell clearly designed the G4 so that tech features enhance, rather than complicate, the vape. If you want βno frills,β you can ignore the extras and just inhale to vape β the Caliburn G4 Mini essentially caters to that plug-and-play simplicity. But if you appreciate having adjustable settings on a pod, the G4 offers that in a very accessible way. Overall, from fill method to firing, the Caliburn G4βs functionality is top-notch for a USB-C pod device in this class, merging the convenience of a beginner device with the customization of an advanced kit.
Performance and Vapor Experience
When it comes to performance, the Uwell Caliburn G4 truly shines where it matters most: delivering a satisfying, flavorful vapor experience. Uwell has a reputation for excellent coil design and flavor in its pod systems (their PRO-FOCS flavor testing is well known), and the G4 pod vape carries that legacy forward. In fact, both the Caliburn G4 and G4 Mini prioritize taste to such an extent that Uwell claims a 35% increase in flavor satisfaction over the previous generatioβ. After testing the device with various e-liquids (including nicotine salt 50/50 blends and standard 70/30 freebase liquids), we can confidently say the flavor production is among the best in any nicotine salt pod of this size.
Coils and Flavor Quality: The Caliburn G4 kit includes two pod cartridges: a 0.6 Ξ© mesh pod and a *0.9 Ξ© mesh podβ. Both use Uwellβs new mesh coil design and improved wicking. The 0.9 Ξ© pod is tailored for Mouth-to-Lung vaping and higher nicotine liquids β it produces a slightly warmer throat hit and concentrated flavor, ideal for nic salts around 20β50 mg. The 0.6 Ξ© pod allows a bit more airflow and vapor, suiting lower strength nic salts or freebase liquids (e.g. 6β12 mg) for a Restricted Direct Lung style inhale. Flavor from both pods is excellent; the PRO-FOCS 4.0 tech seems to really βlock inβ the essence of the e-juice, whether itβs a simple tobacco or a complex dessert flavoβ. In Waves mode especially, each puff is pure and consistent from start to finish β you taste all the notes of the e-liquid without dry hits or burnt hints. Uwellβs coils also heat evenly thanks to the UΒ² tech, which helps prevent hotspots and premature burn-ouβ. Even after a week of use, we found the flavor remained strong, indicating the G4 pods do live up to the promise of longer coil life and sustained flavor quality.
Vapor Production: Given its small size, the Caliburn G4 is not intended to chase clouds, but it outputs a very satisfying amount of vapor for a pod system. At the full 35 W (with the 0.6 Ξ© pod in Storm Mode), it produces a surprisingly dense and warm puff β easily enough vapor to do a restricted lung inhale with a noticeable exhale cloud. In more typical usage (0.9 Ξ© pod around 18 W in Waves Mode), the vapor is a bit cooler and thinner, perfect for a discreet MTL draw that mimics smoking. The throat hit is smooth but present, especially with nicotine salt e-liquids. The G4βs airflow control lets you achieve a stronger throat hit by tightening the draw. With the airflow nearly closed, 50 mg salts deliver a quick and satisfying punch, confirming this device is very *nicotine salt friendlyβ. We also tested some 70% VG freebase liquid in the 0.6 Ξ© pod; the G4 handled the higher VG just fine (thanks to the mesh coilβs wicking efficiency), producing thicker vapor and a direct-lung style inhale β though for prolonged use high-VG might reduce coil lifespan slightly. Overall, the Caliburn G4βs performance is versatile: it can be run as a stealthy MTL device or a mini cloud machine, simply by adjusting pods and airflow. The power delivery is impressively consistent due to the regulated chipset β even as the battery drains, the device maintains steady output with no weak hits until the battery is very low.
Draw Activation & Response: The G4 fires immediately upon draw, with virtually zero delaβ. Uwell has refined their auto-draw sensor to be very sensitive; a gentle puff is all thatβs needed to activate, yet it doesnβt misfire in your pocket (likely the internal pressure sensor is well-calibrated). For those who prefer button-firing, the response is equally instant. Thereβs no lag or ramp-up time, especially in Storm Mode which is designed to ramp power quickly. This means you get a satisfying puff on demand, an important factor for ex-smokers who want that immediate nicotine delivery.
Compared to the Caliburn G3: If youβre curious how the G4βs performance compares to its predecessor, here are a few key upgrades. The G3 had a smaller battery (900 mAh) and max 25 W outpuβ, so it wasnβt as powerful. The G4βs increase to 35 W and improved coils means more vapor and stronger performance when you want it. The flavor on the G3 was already good, but the G4βs PRO-FOCS 4.0 coils are noticeably more flavorful and last longer before flavor decline. Users of the G3 often praised it, and many wondered if the G4βs pods could really be better β Uwellβs tests indicate yes, with G4 pods outperforming G3 pods in both taste and lifespaβ. Additionally, the G4βs leak resistance is enhanced (G3 had a standard anti-leak design, but G4βs UΒ² tech further reduces any condensation or seepagβ). In practical terms, the G4 is an all-around performance upgrade over the G3, offering more power for RDL vaping and more efficient coils for MTL.
In summary, the Caliburn G4 delivers smooth, flavorful draws consistently. Whether you use high-PG nic salts or regular freebase juice, it provides an enjoyable vape that can be tailored to your liking. The addition of power modes adds a new dimension β Storm Mode can make the vapor warmer and throat hit stronger for those moments you need intensity, while Waves Mode ensures everyday puffs are silky and rich in flavor. There is no noticeable sputtering or flooding; the pods wick efficiently and the draw sensor is precise. For a device this compact, the performance is outstanding, making the G4 a top contender among MTL pod devices and even capable of satisfying moderate DL vapers in a pinch. Uwell has managed to create a pod kit that βbalances innovation with user-friendly designβ, truly delivering on the promise of taste above everythinβ.
User Experience and Ease of Use
Using the Uwell Caliburn G4 as a daily vape is a pleasure thanks to its thoughtful ergonomics and beginner-friendly operation. One of the first things new users will notice is just how intuitive the device is. Despite the inclusion of a screen and multiple features, you can literally fill the pod, turn it on, and start vaping β no complex setup needed. The auto-draw mechanism means thereβs no learning curve for inhaling; it feels very natural, especially for those transitioning from smoking. If you do want to explore settings, the single-button control and simple menu icons make it straightforward. The device even offers vibration feedback for certain actions (for example, a slight buzz when you insert a pod or switch modes), giving a nice confirmation without any confusion. Ergonomics and Comfort: The G4βs slim pen-style shape and lightweight build make it effortless to carry and use. Itβs comfortable to hold for extended sessions, and the mouthpiece on the pods has been ergonomically contoured to fit the lips better than previous Caliburn versionsβ.
This improved mouthpiece design provides a snug, comfortable fit for MTL draws, contributing to an overall better user experience (no awkward feeling or air leakage at the lips). The fire button is small and flush, positioned perfectly where your index finger or thumb naturally rests, yet itβs slightly recessed to prevent accidental presses. The screen, while providing ample info, is also discreet β itβs off when not in use, so the device can appear as low-key as a screenless pod. For those who prefer stealth vaping, you can even turn the screen off (using the Day/Night theme toggle or simply relying on auto-draw with no need to wake the display).
Menu and Settings: Learning the G4βs interface takes just a few minutes. Uwell kept the menu minimal: you have the two vape modes, power adjustment, and theme settings. Thereβs no convoluted menu tree; the functional icons on the display make it clear (e.g. a little cloud for modes, a palette icon for themes, etc.)β. In use, I found that I rarely needed to fiddle with settings after the initial setup. I set my preferred wattage for each pod, and then simply enjoyed the device. The puff counter is a nice touch for tracking usage β it resets daily (when the device powers off for a certain period), allowing you to monitor how many puffs you take in a day, which can be useful for those mindful of consumption.
Reliability: Over weeks of use, the Caliburn G4 proved to be very reliable. There were no random misfires, no times it failed to fire on inhale, and no error messages. The pods click in securely with strong magnets, and the connection is consistent β we didnβt encounter any βno atomizerβ errors or connectivity issues. The battery life indicator on the screen is accurate, and the device gives a clear warning when the battery is low (and eventually refuses to fire when critically low, to prevent under-voltage). We also appreciate that the G4 has all the standard safety protections built-in (short-circuit protection, over-charge protection, 8-second cut-off, etc.), which operate behind the scenes to keep everything safe. Essentially, itβs a worry-free vape: just keep it filled and charged, and it performs without fuss.
Battery Life and Charging
Battery performance is another area where the Caliburn G4 outclasses many competitors. It comes with a 1300Β mAh built-in batteryβ
, which is a significant capacity for a slim pod device. For context, 1300Β mAh is larger than the Caliburn G3βs 900Β mAh and even bigger than some other popular pods like the Vaporesso XROS 3 (which has around a 1000Β mAh battery). In daily use, this translates to excellent battery life for the G4. With moderate vaping (letβs say a pack-a-day smoker equivalent, around 200 puffs a day), the G4 can easily last a full day and then some. Uwellβs testing notes the G4 can last about 1.5 days on a single charge for moderate vapersβ.
In our real-world trial, starting at full charge in the morning, we didnβt need to plug in until late into the next day. Even heavy vapers who take hundreds of puffs a day will likely get through the workday without needing to recharge. The power efficiency is notable β when using the device in lower power MTL mode, the battery drains very slowly. Of course, running at higher wattages (25β35 W in Storm Mode) will consume the battery faster, but even then the 1300 mAh holds up well. The Caliburn G4 Mini, by comparison, has an 1100 mAh batteryβ.
Itβs slightly smaller, yet still quite good for a mini device. The Mini should last roughly a full day of use before needing a charge, since it runs at similar wattages. If battery longevity is your top concern, the full-size G4 has the edge simply due to that extra 200 mAh capacity (roughly 18% more). For most users, both devices provide ample battery life, but itβs nice knowing the G4 has one of the largest batteries in its class. When it is time to charge, the G4 makes it quick and painless. It uses a USB Type-C port with fast charging (up to 2 A current)β.
In our testing, a full charge from dead took around 40-45 minutes with a 2A USB-C charger β impressively fast. If youβre in a hurry, a 15-minute charge gave roughly 50% battery, which can power a lot of puffs thanks to the deviceβs efficiency. This fast-charging capability is a huge plus for those who might forget to charge overnight; you can top up the G4 in the morning or during a short break and be good to go. The LED on the screen shows the charging progress, and it will indicate when fully charged. The device does not get overly warm when charging, a sign of good battery management inside.
Pros and Cons
Advantages:
- Outstanding flavor (PRO-FOCS 4.0 coils, excellent nicotine salt handling)
- Long-lasting pods (1β2 weeks per pod, increased lifespan)
- Versatile airflow (adjustable MTL to RDL draws)
- Strong battery life (1300 mAh, fast USB-C charging)
- Informative screen & adjustable wattage (0.85β³ screen, customizable modes)
- Excellent build quality (durable, pocket-friendly design)
- Leak-resistant (ultrasonic welding, minimal condensation)
- Cross-compatible pods (supports G4 and older G3 pods)
- User-friendly (easy for beginners, customizable for advanced users)
- Fast draw activation (instant firing, smooth delivery)
Disadvantages:
- Higher initial cost (slightly pricier than basic pod kits)
- Integrated coil pods (entire pod replacement needed)
- Screen vulnerability (risk of damage from drops)
- No fully closed MTL draw (may not satisfy ultra-tight MTL users)
- Limited initial pod availability (new product, initially less widespread)
- Minor filling inconvenience (side-fill rather than top-fill)
- No advanced temperature controls (limited advanced settings)
- Slightly bulkier (compared to ultra-minimal pods like Caliburn A2)
Overall, the Caliburn G4’s exceptional performance and features significantly outweigh its minor drawbacks.
Conclusion:
The Uwell Caliburn G4 stands out as one of the best pod systems of 2025, combining top-tier flavor, smart features, and everyday ease of use. With PRO-FOCS 4.0 coils, a 1300β―mAh battery, and a bright 0.85β³ screen, it strikes the perfect balance between simplicity and performance. Whether you’re a beginner who just wants to fill and vape, or a seasoned user who enjoys customizing airflow and wattage, the G4 delivers.
Its versatile draw options, long-lasting pods, and durable build make it a reliable daily device, while unique additions like Storm and Waves Modes set it apart from competitors. Though slightly pricier than ultra-basic pods, its value shines through in flavor, longevity, and user experience.
In short: if you want a pod vape that does it all β great taste, smart features, strong battery, and no fuss β the Caliburn G4 is an excellent choice.
