Review Summary
The Uwell Caliburn G4 Classic Pod Kit delivers a genuinely broad feature set for a compact pod system, with dual-sensor auto-draw, PRO-FOCS 4.0, and a wide 5 to 35W output range covering both mouth-to-lung and restricted direct lung styles. Compatibility with Caliburn G3 and GPP pod platforms extends the coil ecosystem beyond what most devices in this class provide. The absence of a USB-C cable and the 0.4 ohm pod's restriction to freebase e-liquids are the main practical limitations to account for.
The Uwell Caliburn G4 Classic Pod Kit is a Uwell pod kit designed for MTL vaping , powered by a 1400mAh battery with a 2ml e-liquid capacity and USB C charging , available in 4 colours.
| Brand | Uwell |
| Vape Kit Type | Pod Kit |
| Battery | 1400mAh |
| Charging | USB C |
| Power Range | 35W |
| Coil Resistance | Ranging from 0.4Ω to 0.9Ω |
| Vape Style | MTL |
| Capacity | 2ml |
| Refilling | Top Fill |
| Airflow | Adjustable |
| Colours Available | 4 Colours Available |
The Caliburn G4 Classic is built from aluminium, PC, and PCTG, a combination that keeps the device light enough for all-day pocket carry whilst giving it a solidity that distinguishes it from fully plastic pod kits in this price bracket. At 29 x 16.6 x 115.9mm it sits at the slender end of the compact pod kit category, fitting comfortably in hand without the width that wider box-style pod devices introduce. The aluminium chassis contributes to a quality feel that remains consistent with the premium positioning Uwell has maintained across the Caliburn series.
The recessed airflow slider runs along the body of the device and adjusts continuously with no fixed detents, covering draw resistance from a relatively open restricted lung style down to a tighter mouth-to-lung configuration. Each Caliburn G3 pod also carries its own reversible airflow inlet, giving a second layer of draw adjustment on top of the main slider. Both mechanisms are accessible without tools and require no complex setup, which keeps the initial configuration process manageable for vapers moving across from simpler devices.
The 14 RGB LED battery indicator uses a colour progression to communicate charge level: green indicates a healthy charge, blue signals mid-range depletion, and red flags a low battery. This colour-coded system provides a clear at-a-glance read on remaining charge without requiring a screen or a dedicated display panel, keeping the exterior clean and uncluttered. The fire button sits flush with the device body with a 255g activation threshold that prevents accidental firing in a bag or pocket without making the button feel stiff in regular use.
All Uwell vape kits sold in the UK comply with the requirements set out under the UK TPD regulations, and the Caliburn G4 Classic is no exception. The included Caliburn G3 pods are 2ml capacity and TPD-compliant, as are all replacement pods and GPP pods available for the device. Charging is via USB-C at 5V/2A, though a cable is not supplied in the box. Vapers who do not already own a compatible USB-C cable will need to source one separately before the device can be charged from its initial state.
The dual-sensor auto-draw system is the most significant performance upgrade the G4 Classic introduces over earlier Caliburn devices. Running two sensors simultaneously, Uwell claim 99.999% trigger accuracy and a lifespan around 300% longer than single-sensor designs. In practical use this translates to immediate, consistent draw activation from the first inhale of each session, without the slight lag or missed activation that can develop in single-sensor pod kits as they age. The improvement in draw reliability becomes more apparent over time, particularly for vapers who use auto-draw as their primary activation method.
The G4 Classic ships with two distinct pod options that serve genuinely different use cases. The pre-installed 0.4 ohm Caliburn G3 pod is rated for 25 to 35W use and produces an open restricted direct lung draw suited to 50/50 and higher-VG freebase e-liquids. The 0.9 ohm pod supplied as a spare is rated for 10 to 20W and delivers a tighter mouth-to-lung experience well matched to nicotine salt e-liquids at 10mg to 20mg. Both pods use top-fill designs with pre-installed mesh coils and slot into the device without adapters or tools. Replacement Uwell pods for both platforms are available separately when the originals reach the end of their coil life.
Beyond the two included G3 pods, the G4 Classic also accepts GPP pods across a 0.4 ohm to 1.2 ohm resistance range in five steps. This broader coil ecosystem suits vapers who move between draw styles or who want to experiment with different resistance levels without buying a second device. GPP pods at 0.8 ohm to 1.2 ohm suit nicotine salts and 50/50 freebase at lower wattages in the 10 to 20W range, while GPP pods at 0.4 ohm to 0.6 ohm cover restricted direct lung use at 20 to 35W alongside freebase e-liquids. High-VG blends of 70/30 and above are not recommended for MTL pods or GPP pods rated at 0.8 ohm and above, as thicker liquids can struggle to wick efficiently through the tighter coil structure at lower wattages.
PRO-FOCS 4.0 manages power delivery to the coil automatically once the output wattage is set, maintaining consistent vapour temperature and density across a session. There are no separate vaping modes to cycle through: set the wattage with the button, adjust the airflow slider, and the device handles the rest. The U2 anti-leak system built into the G3 pod structure uses a U-shaped internal channel to prevent e-liquid from migrating to the airflow chamber during pocket carry, which is particularly relevant for vapers using nicotine salt liquids in the 0.9 ohm pod configuration. Uwell specifically advise against pairing nicotine salt e-liquids with the 0.4 ohm G3 pod due to potential leaking and throat sensitivity at higher wattages, and this guidance is worth following.
A 1400 mAh battery is a practical choice for a compact pod kit at this output range, and under moderate mouth-to-lung use the Caliburn G4 Classic comfortably covers a full day on a single charge for most vapers. Those who use the device primarily through the 0.9 ohm pod in the 10 to 20W range will find the battery endurance particularly strong, as the lower average draw on the cell at those wattages extends run time noticeably compared with sustained higher-wattage use. Heavier vapers, or those running the device consistently at the upper end of the 25 to 35W range through the 0.4 ohm pod, can expect around half to two-thirds of a day before the LED indicator shifts to red and a charge is needed.
Charging via USB-C at 5V/2A returns the battery to full at a reasonable rate without requiring a proprietary cable, which is a practical advantage for vapers who already carry USB-C cables for other devices. The 14 RGB LEDs make it easy to monitor charge level at a glance throughout the day, removing the need to guess at remaining capacity based on performance alone. The colour transition from green through blue to red gives enough warning to plan a charge before the battery depletes entirely during a session.
The G4 Classic does not support passthrough vaping during charging, so the device will be off use for the duration of a charge cycle. Vapers who need an uninterrupted supply during the working day may find it worth pairing the G4 Classic with a spare pod to rotate between, or planning charges around natural breaks in their routine. Bundling the G4 Classic with compatible pods through the vape kit bundles section can reduce the ongoing cost of maintaining a pod stock alongside the device, and the vape deals section regularly carries offers on compatible pods and e-liquids worth checking alongside purchase.
A USB-C charging cable is not included in the kit. This is an increasingly common omission across the category, but it is worth confirming a compatible cable is already to hand before first use. Any standard USB-C cable rated at 5V/2A will work with the device; no proprietary hardware is required.
The Caliburn G4 Classic is set up and ready to vape with minimal preparation. Filling the included pods is handled through the top-fill port on each G3 pod, which keeps mid-session refills clean and accessible without removing the pod from the device. The 0.4 ohm pod arrives pre-installed, so the initial setup process amounts to filling the pod, allowing around five minutes for the mesh coil to saturate, and starting with shorter draws before settling into a normal cadence. The 0.9 ohm spare pod follows the same priming process when it is first loaded.
Wattage adjustment is handled with the fire button: pressing the button cycles through the output range in increments, with the RGB LED array displaying the current level via colour coding. Two clicks lock the fire button and restrict activation to auto-draw only, which is a useful setting for pocket carry without powering down entirely. Five clicks powers the device off, and five clicks again powers it back on. The button layout is simple enough to commit to memory quickly, and the 255g fire threshold prevents the kind of accidental activations that can drain the battery or fire the device while it is stowed.
The stepless airflow slider sits in a recessed channel that protects it from inadvertent adjustment in a bag or pocket. Starting from a mid position and adjusting to preference takes only a few draws to dial in. The reversible airflow on the G3 pod provides a second axis of control that most vapers will set once and leave, rather than adjusting session to session. For vapers new to adjustable output and airflow, the G4 Classic has more controls to learn than a fixed-output pod kit, but none of the individual controls are complex in isolation.
Switching between pod platforms is handled through the same slot connection, with both G3 and GPP pods loading and removing without tools. Vapers who maintain a stock of refillable pods across different resistance options can cycle between mouth-to-lung and restricted direct lung setups by swapping pods, without needing to access any device menus or change any internal settings. Replacement Caliburn pods are available in both G3 and GPP formats to keep a rotation of fresh coils ready.
The Caliburn G4 Classic is most at home in the hands of a vaper who wants more flexibility than a fixed-resistance, single-platform pod kit provides but is not ready to move into full sub-ohm territory. The combination of adjustable output, dual pod platform compatibility, and stepless airflow means the device can be configured for a tight nicotine salt mouth-to-lung draw at lower wattages or shifted into a more open restricted direct lung setup on freebase e-liquids, all within the same compact form factor. Vapers who find that smaller-capacity pod kits run low before the end of the working day will also appreciate the 1400 mAh battery, which provides a genuine step up in endurance over more compact cells without a significant increase in device size.
Existing Caliburn users who already have a stock of G3 pods will find the G4 Classic a logical next step, since the pod platform carries across directly and the familiar top-fill format requires no adjustment. The dual-sensor auto-draw improvement is also likely to matter most to vapers who have noticed activation inconsistency or gradual degradation in their current draw-activation device, since the G4 Classic specifically addresses that point.
Vapers looking for a simpler, lower-cost entry into pod vaping with one fixed resistance and no output adjustment will find the G4 Classic more involved than they need. The broader pod kits collection includes simpler options at lower price points for vapers at that stage. Those after a full direct lung or sub-ohm experience at higher wattages will also find the 35W ceiling and pod format limiting compared with a dedicated box mod setup, and the wider vape kits range covers those options across multiple brands and output levels.
For vapers who regularly move between draw styles, prefer a quality build in a compact everyday carry size, and want a coil ecosystem that extends beyond a single resistance option, the G4 Classic represents a well-specified choice within the full Uwell range. It covers the ground between a basic pod kit and a more complex open-system device without requiring the size, cost, or complexity of either extreme.
Finding the right pods for your Uwell Caliburn G4 Classic Pod Kit is essential for getting the best performance and flavour out of your device. There is 1 compatible option currently available, Uwell Caliburn GPP Refillable Replacement Pods . Using the correct pods ensures optimal coil life, consistent vapour production, and the best possible flavour accuracy from your nic salts or e-liquids. Always make sure you're using genuine Uwell pods to avoid any compatibility or safety issues.
To put the Uwell Caliburn G4 Classic Pod Kit in context, here is how it stacks up against Uwell Caliburn G3 Pod Vape Kit and Uwell Caliburn G3 Pro Pod Kit across the key specs that matter.
If you want to learn more about refillable pod kits, how to choose the right coil resistance, and which nicotine salts work best with your setup, these guides are worth a read.
Think the Uwell Caliburn G4 Classic Pod Kit is the right kit for you? Pick one up below with fast UK delivery from WizVape.
The Caliburn G4 Classic is manageable for beginners but has more controls than a basic fixed-output pod kit. The wattage adjustment, stepless airflow slider, and dual pod platform compatibility offer more flexibility than most starter devices, which means there is a short learning curve before the setup feels natural. Vapers who want a simpler first device may find a fixed-resistance single-pod system easier to start with, while those who are prepared to spend a little time dialling in the settings will find the G4 Classic rewarding from early on.
The Caliburn G4 Classic accepts two pod platforms: Caliburn G3 pods in 0.4 ohm and 0.9 ohm, and GPP pods across five resistance steps from 0.4 ohm to 1.2 ohm. The 0.4 ohm G3 pod comes pre-installed and is suited to restricted direct lung vaping with freebase e-liquids. The 0.9 ohm G3 pod is supplied as a spare and is the recommended option for mouth-to-lung vaping on nicotine salts. GPP pods are sold separately and extend the compatible range for vapers who want to explore additional resistance options.
Under moderate mouth-to-lung use, most vapers find the 1400 mAh battery lasts a full day on a single charge. Heavier vapers or those using the device consistently at the upper end of the 25 to 35W range through the 0.4 ohm pod can expect around half to two-thirds of a day before a recharge is needed. The 14 RGB LEDs provide colour-coded battery feedback, switching from green to blue to red as the charge level drops.
The 0.9 ohm Caliburn G3 pod and GPP pods at 0.8 ohm to 1.2 ohm are best paired with nicotine salt e-liquids at 10mg to 20mg, or 50/50 freebase at lower strengths. The pre-installed 0.4 ohm G3 pod and GPP pods at 0.4 ohm to 0.6 ohm suit 50/50 and higher-VG freebase e-liquids for restricted direct lung vaping. Uwell specifically advise against using nicotine salts with the 0.4 ohm G3 pod due to potential leaking and throat sensitivity at higher wattages. High-VG blends of 70/30 or above are not recommended for any of the MTL pod configurations.
The Caliburn G4 Classic builds on the G3 platform by introducing a dual-sensor auto-draw system, a larger 1400 mAh battery, and a wider 5 to 35W output range. The G3 pod format carries across to the G4 Classic, so existing Caliburn G3 pod stock is fully compatible. PRO-FOCS 4.0 also arrives on the G4 Classic as an updated version of Uwell's flavour atomisation platform. Vapers who find their current Caliburn runs low before the end of the day, or who want more control over output and airflow, will find the G4 Classic a meaningful step forward.
No, the Uwell Caliburn G4 Classic does not include a USB-C charging cable in the box. The device charges via USB-C at 5V/2A, and any standard USB-C cable at that rating will work. Vapers who do not already own a compatible cable will need to source one separately before the device can be charged.
Yes, nicotine salts are the recommended e-liquid choice for the 0.9 ohm Caliburn G3 pod at 10mg to 20mg, and for GPP pods at 0.8 ohm to 1.2 ohm. However, Uwell advise against using nicotine salt e-liquids with the pre-installed 0.4 ohm G3 pod due to the potential for leaking and throat sensitivity at the higher wattages that pod requires. Vapers who vape primarily on nicotine salts should use the 0.9 ohm pod as their main setup.
PRO-FOCS 4.0 is Uwell's fourth-generation flavour atomisation platform, built into the Caliburn G4 Classic to manage power delivery to the coil automatically. The system works alongside the device's output circuit to maintain consistent vapour temperature and density across the wattage range, without requiring the vaper to switch between modes or adjust settings during a session. Set the wattage, adjust the airflow, and PRO-FOCS 4.0 handles power delivery from there.
The Caliburn G4 Classic runs two sensors simultaneously rather than a single sensor, with Uwell claiming 99.999% trigger accuracy and a lifespan around 300% longer than single-sensor designs. In practice this means draw activation is immediate and consistent from the first inhale of each session, and the system is designed to maintain that reliability well into the life of the device. Auto-draw remains available at all times unless it is locked using the two-click fire lock function.
The Caliburn G4 Classic has an adjustable output range of 5 to 35W. The 0.9 ohm Caliburn G3 pod is rated for use at 10 to 20W for mouth-to-lung vaping, while the pre-installed 0.4 ohm pod is rated for 25 to 35W restricted direct lung use. GPP pods cover similar wattage bands depending on resistance, from 10 to 20W for higher-resistance MTL options through to 20 to 35W for lower-resistance RDL configurations.
The Caliburn G3 pods use Uwell's U2 anti-leak system, which employs a U-shaped internal channel to prevent e-liquid from migrating to the airflow chamber during normal use and pocket carry. Using the correct e-liquid type for each pod is also important: the 0.9 ohm G3 pod is designed for nicotine salts and 50/50 freebase, while the 0.4 ohm pod should only be used with 50/50 and higher-VG freebase liquids. Uwell specifically advise against nicotine salt e-liquids in the 0.4 ohm pod, and following this guidance will significantly reduce the risk of leaking.
Two clicks on the fire button locks the fire button and restricts the device to auto-draw activation only, which is a useful setting for pocket carry. Five clicks powers the device off entirely. To restore fire button activation, press it twice again; to power back on, five clicks activates the device.
The Uwell Caliburn G4 Classic Pod Kit is available from WizVape, held in UK stock and ready to dispatch. WizVape also stocks compatible Caliburn G3 replacement pods, GPP pods across the full resistance range, and a selection of nicotine salt and freebase e-liquids suited to the device. All products comply with UK TPD regulations.
