A dual-sensor auto-draw system and 1400 mAh battery with adjustable output from 5 to 35W set the Uwell Caliburn G4 Classic Pod Kit apart from most compact vape kits in this class. The G4 Classic accepts both Caliburn G3 pods and GPP pods across a 0.4Ω to 1.2Ω resistance range, giving it a broader coil platform than typical single-platform pod systems. It sits within a well-established Uwell range that the Caliburn series has helped define, with PRO-FOCS 4.0 flavour technology and stepless airflow control built in as standard. In stock in the UK and ready to dispatch.
Below we break down the key features, pod compatibility, and real-world performance of the Uwell Caliburn G4 Classic Pod Kit to help you decide if it's the right vape for you.
What Makes the Uwell Caliburn G4 Classic Different?
The most notable technical feature of the Uwell Caliburn G4 Classic is its dual-sensor auto-draw system. Uwell claim 99.999% trigger accuracy and a lifespan around 300% longer than single-sensor designs, making draw activation more responsive and more durable over extended use. The 1400 mAh battery supports adjustable output from 5 to 35W, covering everything from a tight mouth-to-lung configuration through to an open restricted direct lung draw. An aluminium and PCTG body keeps the device compact at 29 x 16.6 x 115.9mm while maintaining a quality feel in hand.
The G4 Classic runs both Caliburn G3 pods and GPP pods, giving vapers access to a wider resistance range than most pod kits offer on a single platform. G3 pods cover 0.4Ω and 0.9Ω, while GPP pods extend the range from 0.4Ω to 1.2Ω in five steps. Fourteen RGB LEDs colour-code the battery level, switching between green, blue, and red as charge drops, and the stepless airflow slider adjusts continuously with no fixed stops. For vapers exploring the full Uwell vape kits catalogue alongside the G4 Classic, the range covers a spread of styles and output levels to suit different preferences.
Dual-Sensor Auto-Draw
Two sensors run simultaneously to register each inhale. Uwell claim 99.999% trigger accuracy and a lifespan around 300% longer than single-sensor designs, meaning the auto-draw remains reliable well into the life of the device.
Stepless Airflow
A recessed slider adjusts airflow continuously with no fixed stops, covering everything from a tight mouth-to-lung draw to a more open restricted draw. Each Caliburn G3 pod also has its own reversible airflow for a second level of adjustment on top of the main slider.
G3 and GPP Pods
The G4 Classic accepts both Caliburn G3 and GPP pods, covering resistances from 0.4Ω to 1.2Ω across the two platforms. That range suits nic salts, 50/50 freebase, and higher VG e-liquids depending on the pod and wattage chosen.
PRO-FOCS 4.0 and Flavour Consistency
PRO-FOCS 4.0 is Uwell's fourth-generation flavour atomisation platform, built into the Caliburn G4 Classic pod kit. The system works with the device's output circuit to manage power delivery to the coil, aiming to maintain consistent vapour temperature and density across the wattage range. Paired with the dual-sensor auto-draw, the device responds consistently from the first puff of a session through to the end of the coil's usable life. There are no separate vaping modes to navigate: set the wattage, adjust the airflow slider, and PRO-FOCS 4.0 handles the rest automatically.
The U² anti-leak system is built into the Caliburn G3 pod structure, using a U-shaped internal configuration to prevent e-liquid from travelling to the airflow chamber during normal use and pocket carry. This is particularly relevant when using nic salt e-liquids in the 0.9Ω pods, as higher-VG salt liquids can seep into poorly sealed pod designs. Uwell advise using the 0.9Ω Caliburn G3 pod for mouth-to-lung vaping and reserving the 0.4Ω pod for restricted direct lung use, where freebase e-liquids are the correct pairing.
Caliburn G3 and GPP Pod Compatibility
The Uwell Caliburn G4 Classic runs two distinct pod platforms, making its coil ecosystem wider than most compact vaping devices in this category. The Caliburn G3 pods included in the kit use pre-installed mesh coils and a top-fill design, with the 0.9Ω pod suited to mouth-to-lung vaping on nic salts and 50/50 freebase, and the 0.4Ω pod handling the restricted direct lung style with higher VG freebase. Replacement G3 pods with fresh coils are available from the Uwell coils section when the originals reach the end of their life.
GPP pods extend the compatible resistance range from 0.4Ω up to 1.2Ω in five steps, covering the full spectrum from tight mouth-to-lung through to restricted direct lung vaping, and are available in both top-fill and side-fill versions. This makes the G4 Classic a versatile pod kit for vapers who move between draw styles, or who want to experiment with different resistances without buying a new device. The full selection of compatible pod options is available from the Uwell Caliburn pods collection. The 0.4Ω G3 pod comes pre-installed in the device, with the 0.9Ω pod supplied as a spare.
Pod Compatibility and Coil Options
The Caliburn G4 Classic ships with two Caliburn G3 pods covering mouth-to-lung and restricted direct lung use from the moment it is unpacked. GPP pods are available as additional options across a wider resistance range. Use the coil finder to identify compatible replacement pods for both platforms.
- 0.9Ω Caliburn G3 Pod: Tight to mid mouth-to-lung draw. Pairs well with nicotine salts and 50/50 freebase e-liquids up to 20mg. Supplied as spare pod in kit.
- 0.4Ω Caliburn G3 Pod: Open restricted direct lung draw. Suited to 50/50 and higher VG freebase e-liquids only. Pre-installed in device. Uwell advise against pairing this pod with nic salt e-liquids due to potential leaking and throat sensitivity at higher output wattages.
- GPP 0.8Ω–1.2Ω: MTL range across multiple resistance steps. Suits nicotine salts and 50/50 freebase. Sold separately.
- GPP 0.4Ω–0.6Ω: Restricted direct lung range. Suits 50/50 and higher VG freebase e-liquids. Sold separately.
A wider selection of compatible replacement pods is available from the Uwell replacement pods collection, covering both G3 and GPP formats.
Real-World Performance and Long-Term Use
Across the included G3 pod options, the G4 Classic delivers distinct draw characters at each resistance. The 0.9Ω pod produces a tighter mouth-to-lung experience well suited to nic salt e-liquids, while the pre-installed 0.4Ω pod opens the draw for a restricted direct lung style that works with higher VG freebase. PRO-FOCS 4.0 manages power delivery automatically once the wattage is set, so there is no need to adjust output between sessions. The stepless airflow adds further control, and the reversible airflow on the G3 pod gives a secondary adjustment that most vapers will dial in once and leave.
The fire button requires 255 grams of force to activate, which prevents accidental firing in a bag or pocket. Two clicks on the button locks the fire function for auto-draw only use, and five clicks powers the device off entirely. The G3 pods use a top-fill design, keeping mid-session refills straightforward. Heavily sweetened e-liquids can shorten coil life on mesh designs, so vapers who favour dessert or candy-style profiles may find they need to replace pods more often than those using fruit or menthol liquids.
Uwell Caliburn G4 Classic Specifications
| Battery |
1400 mAh |
| Output |
5–35W (adjustable) |
| Charging |
USB-C, 5V/2A (cable not included) |
| Display |
14 RGB LEDs (colour-coded battery level) |
| Activation |
Button + dual-sensor auto-draw |
| Airflow |
Stepless slider, recessed |
| Pod Capacity |
2ml (TPD) |
| Resistance Range |
0.4Ω–1.2Ω |
| Dimensions |
29 x 16.6 x 115.9mm |
| Construction |
Aluminium, PC, PCTG |
| Coil Technology |
PRO-FOCS 4.0 |
| Leak Prevention |
U² anti-leak |
How Does the Uwell Caliburn G4 Classic Compare to the Caliburn G3?
The Uwell Caliburn G4 Classic adds a 1400 mAh battery and an extended 5 to 35W output range over previous Caliburn models, giving vapers more power reserve and more flexibility across their coil and airflow setup. The dual-sensor auto-draw is a clear step forward, replacing the single-sensor design used in earlier Caliburn devices with a system Uwell claim delivers 99.999% trigger accuracy and around 300% longer lifespan. PRO-FOCS 4.0 also arrives on the G4 Classic as the latest iteration of Uwell's flavour atomisation platform, working alongside the U² anti-leak pod structure.
The Caliburn G3 pod platform carries directly into the G4 Classic, which means existing G3 users can continue with their current coil stock without switching formats. The familiar top-fill design and compact form factor remain consistent with the Caliburn line. Vapers who regularly run their current Caliburn low before the end of the day, or who want more control over output and airflow, will find the G4 Classic a meaningful step up. Those perfectly happy with their existing Caliburn and finding the battery lasts a full day without issue may not feel an urgent reason to move.
How Long Does the Uwell Caliburn G4 Classic Battery Last?
Under moderate mouth-to-lung use, most vapers find the Uwell Caliburn G4 Classic lasts a full day on a single charge from the 1400 mAh battery. Heavier vapers, or those using the device at higher wattages for restricted direct lung draws, will see shorter run times, with a reasonable expectation of around half to two-thirds of a day under sustained higher-output use. Charging is via USB-C at 5V/2A, which returns the battery to full at a reasonable rate without requiring a proprietary cable. A USB-C cable is not included in the kit and will need to be sourced separately if one is not already to hand.
Getting the Best From Your Uwell Caliburn G4 Classic
Before the first use with any new pod, allow around five minutes after filling for the e-liquid to saturate the mesh coil. This priming time prevents dry hits and helps the coil reach consistent output sooner. The 0.4Ω G3 pod arrives pre-installed and will need priming when the device is first set up, so fill it, wait, and start with shorter draws before settling into your usual cadence. Switching to a fresh pod or a new GPP coil follows the same process.
Start with the airflow slider in a mid position and adjust from there based on your preference. The 0.9Ω G3 pod pairs well with nic salt e-liquids at 10 to 20mg, and the 0.4Ω pod suits 50/50 or higher VG freebase better. Heavily sweetened liquids can accelerate mesh coil wear, so vapers who favour dessert profiles should keep a spare pod available. For a wide selection of nic salt options compatible with the 0.9Ω pod, the nicotine salts collection covers a range of flavour profiles and strengths from 5mg to 20mg.
Who Is the Uwell Caliburn G4 Classic Built For?
The Caliburn G4 Classic suits vapers who want more flexibility from a pod kit than a fixed-resistance, single-platform device typically provides. The dual pod platform, stepless airflow, and 5 to 35W output range make it a genuinely adaptable vaping device, covering mouth-to-lung vaping on nic salts through to restricted direct lung use on freebase e-liquids. The 1400 mAh battery is a practical choice for full-day users who find smaller cells run low by mid-afternoon. The compact aluminium build also makes it a sensible everyday carry for vapers who prioritise a quality feel alongside consistent performance. For an in-depth breakdown of the G4 Classic, read our full Uwell Caliburn G4 Classic Pod Kit Review.
Vapers looking for a simpler, lower-cost pod kit with one fixed resistance and no wattage adjustment may find the G4 Classic more involved than they need. For those cases, the broader Uwell vape kits section includes more straightforward options across the Caliburn line. Vapers after a full sub-ohm or direct lung experience at higher wattages will also find the 35W ceiling and pod format limiting compared with a dedicated box mod or open pod system.
For a wider look at refillable pod kits from across the market, the full vape kits collection covers a broad range of styles, output levels, and price points.
All products on WizVape are held in UK stock and comply fully with UK TRPR/TPD regulations. If you are unsure what that means for the products you are buying, our guide covers it clearly.
E-Liquid Compatibility
The Uwell Caliburn G4 Classic Pod Kit works best with 50/50 VG/PG e-liquids, thin enough to wick efficiently through compact MTL coils and consistent enough to deliver clean flavour at lower wattages. It is built exclusively for mouth-to-lung vaping, with coil resistances spanning from 0.4Ω to 0.9Ω across a 35W output range. Nicotine salt e-liquids are the natural choice at these resistance levels, delivering a smooth, satisfying throat hit at higher nicotine strengths without harshness, which suits the tighter draw of MTL vaping particularly well. Freebase e-liquids at 3mg or 6mg also work well if you prefer a lighter nicotine hit.
Each pod holds 2ml of e-liquid and uses a top fill system, keeping refilling straightforward and mess-free.
High-VG liquids such as 70/30 blends are generally not recommended for tighter MTL pods, as thicker e-liquid can struggle to wick efficiently at lower wattages and may lead to dry hits.
Browse Bar Juice 5000 nic salts for a well-matched pairing, also available as part of our 10 nic salts for £16 multi-buy deal.
Available Colours
The Uwell Caliburn G4 Classic Pod Kit is available in the following 4 colours:
What's In The Box?
- 1x Uwell Caliburn G4 Classic Device
- 1x Caliburn G3 0.4Ω Pod
- 1x Caliburn G3 0.9Ω Pod
- 1x USB-C Charging Cable
- 1x User Manual
