Uwell Caliburn G4: Review, Performance, and Features

The Uwell Caliburn series has long been a benchmark for pod vapes, blending simplicity, portability, and exceptional flavor delivery. With the release of the Uwell Caliburn G4 in early 2025, Uwell has once again raised the bar for compact pod systems. At Vape Talks, we’ve thoroughly tested the Caliburn G4 to bring you an in-depth review of its design, performance, and standout features. Whether you’re a seasoned vaper or a beginner looking for a reliable daily driver, this blog will break down why the Caliburn G4 is a top contender in the crowded pod vape market.

Design and Build: Sleek, Sturdy, and Stylish

The Uwell Caliburn G4 retains the signature minimalism that has made the Caliburn series a favorite among vapers, but it comes with a modern makeover that elevates its aesthetic and functionality. Crafted from durable aluminum alloy, the G4 feels premium in hand while remaining lightweight at just 48 grams. Its slim, ergonomic design with rounded corners and a ridged texture ensures a comfortable grip, making it ideal for on-the-go vaping. The device measures 26mm x 15.65mm x 114.98mm, maintaining the compact form factor that Caliburn fans love.

Available in eight vibrant colors—Seashell White, Glacier Blue, Karst Grey, Flamingo Red, Twilight Silver, Gunmetal Grey, Sahara Gold, and Polar Black—the G4 exudes a youthful charm with a metallic or ceramic texture, depending on the finish. The front of the device features a 0.85-inch HD color screen set within a pearlescent plate, displaying wattage, battery life, puff count, and customizable UI themes. The screen’s animations add a playful touch, though some users may find it a bit gimmicky. On the flip side, a clear juice window allows easy monitoring of e-liquid levels, reducing the risk of dry hits.

However, the G4’s design isn’t without flaws. The small screen and e-liquid window may pose challenges for users with vision impairments, and the tiny function button could be tricky for those with dexterity issues. For vapers prioritizing accessibility, other devices might be better suited, as noted in reviews like Vape Green’s, which highlighted these concerns.

Key Features: What Sets the Caliburn G4 Apart

The Caliburn G4 is packed with features that cater to both beginners and experienced vapers. Here’s a breakdown of its standout specifications:

• 1300mAh Battery: A significant upgrade from the G3’s 900mAh battery, the G4’s 1300mAh capacity offers up to 1.5 days of moderate vaping on a single charge. With a maximum output of 35W, it delivers more power than its predecessors, supporting both mouth-to-lung (MTL) and restricted direct-to-lung (RDL) vaping styles.
  
• Dual Vaping Modes: The G4 introduces two power modes—Storm Mode for intense, powerful hits and Waves Mode for smoother, steadier puffs. These modes allow users to tailor their vaping experience, with Storm Mode likened to a “roller coaster” and Waves Mode to a “London Eye ride.”
  
• Adjustable Airflow: A slider on the pod’s base provides precise airflow control, catering to MTL and RDL preferences. This versatility ensures a customizable draw, from tight and cigarette-like to loose and cloudy.
  
• 0.85-Inch HD Color Screen: The vibrant display shows key metrics like wattage, resistance, and puff count, with customizable themes and animations for a personalized touch.
  
• Upgraded GPP Cartridges with PRO-FOCS 4.0: The G4 uses enhanced Caliburn GPP pods with Uwell’s PRO-FOCS 4.0 flavor technology, delivering a 35% increase in flavor satisfaction and cartridge lifespan compared to previous models. The pods are compatible with the Caliburn G3 series, offering cost savings and convenience.
  
• Leak-Proof Design with U² Technology: Uwell’s U² technique (Ultrasonic Welding and U-shaped Channel Design) minimizes leaks and condensation, ensuring a mess-free experience. The side-fill system with a silicone plug simplifies refilling without removing the pod.
  
• Draw-Activated Firing: The G4’s sensitive auto-draw sensor activates with a gentle puff, eliminating the need for complex menus or buttons. A single multifunctional button handles settings adjustments and locking.

These features make the G4 a versatile device that balances cutting-edge technology with user-friendly operation, appealing to a wide range of vapers.

Performance: Flavor and Vapor That Impress

When it comes to performance, the Uwell Caliburn G4 shines brightest in its flavor delivery and vapor production. Uwell’s PRO-FOCS 4.0 technology, combined with upgraded GPP pods, ensures rich, vibrant flavors whether you’re using nicotine salts or freebase e-liquids. The kit includes 0.4Ω and 0.9Ω GPP pods, catering to RDL and MTL vaping, respectively. The 0.9Ω pod excels for MTL users seeking a tight, cigarette-like draw, while the 0.4Ω pod produces thicker clouds for RDL enthusiasts.

Testing with 50mg nicotine salts and a nearly closed airflow, the G4 delivered a quick, satisfying nicotine hit, making it an excellent choice for those transitioning from smoking. With 70% VG freebase liquid in the 0.6Ω pod, the device handled higher viscosity e-liquids well, producing dense vapor without compromising coil lifespan significantly. The mesh coils’ wicking efficiency and the regulated chipset ensure consistent output, even as the battery drains.

The dual vaping modes add another layer of customization. Storm Mode provides a powerful, intense hit ideal for cloud chasers, while Waves Mode offers a smoother, more relaxed experience for flavor-focused vapers. However, some reviewers, like Vaping360, noted minimal differences between the modes, suggesting the distinction might not be as pronounced for all users.

The G4’s draw activation is highly responsive, firing instantly with no misfires, thanks to a well-calibrated internal pressure sensor. The adjustable airflow slider allows seamless transitions between MTL and RDL, making the G4 versatile enough to serve as a stealthy MTL device or a mini cloud machine. However, prolonged use with high-VG liquids may slightly reduce coil lifespan, as noted in Vape Observation’s review.

User Experience: Simplicity Meets Customization

The Caliburn G4 strikes an excellent balance between simplicity and advanced functionality. For beginners, the draw-activated firing and plug-and-play pods make vaping effortless—just fill, insert, and inhale. For advanced users, the adjustable wattage (5-35W), dual modes, and customizable UI provide room to fine-tune the experience. The single-button interface is intuitive, with a long press to confirm selections, a welcome improvement over “select and wait” systems.

Refilling is a breeze with the side-fill system, which uses a flush silicone plug to prevent leaks while allowing easy access. The 3ml pod capacity is generous for a device of this size, reducing the need for frequent refills. Compatibility with G3 pods adds versatility, allowing users to stick with familiar cartridges or upgrade to the enhanced GPP pods.

One minor drawback is the lack of advanced wattage control, as the G4 relies on pre-set outputs rather than fully adjustable wattage. This simplicity suits most users but may disappoint vapers seeking granular control. Additionally, some users reported issues with pod resistance detection. Which could limit wattage output, though this seems rare and likely due to overused pods.

Durability and Portability: Built to Last

The G4’s aluminum alloy construction and thick plastic shell make it surprisingly durable for its lightweight design. Reviewers, including Vape Green, praised its sturdiness, noting it’s ideal for clumsy vapers. The leak-proof pods and U² technology further enhance reliability, keeping the device clean even after extended use.

At just 48 grams, the G4 is highly portable, slipping easily into pockets or bags. The USB-C charging port ensures quick recharges, with the 1300mAh battery reaching full capacity in roughly 45 minutes. For moderate vapers, the battery life is a standout feature, offering all-day performance without needing a recharge.

Caliburn G4 vs. G4 Mini vs. G3: How Does It Compare?

The Caliburn G4 comes alongside the G4 Mini, a stripped-down version prioritizing simplicity and affordability. The G4 Mini features a 1100mAh battery, a single 0.6Ω pod, and no screen, making it ideal for beginners. While it lacks the G4’s advanced features, it still delivers excellent flavor and leak resistance.

Compared to the Caliburn G3, the G4 offers several upgrades:

• Battery: 1300mAh vs. 900mAh, providing longer usage.
• Power: 35W max output vs. 25W, enabling stronger RDL performance.
• Flavor: PRO-FOCS 4.0 and upgraded GPP pods deliver a 35% improvement in flavor and pod lifespan.
• Leak Resistance: Enhanced U² technology reduces condensation compared to the G3’s standard anti-leak design.

For G3 users, the G4’s pod compatibility means you can upgrade without abandoning your existing pods, making the transition cost-effective.

Pros and Cons

Pros:

• Exceptional flavor with PRO-FOCS 4.0 technology
• Long-lasting 1300mAh battery
• Versatile MTL and RDL vaping with adjustable airflow
• Leak-proof pods with U² technology
• Compact, durable, and stylish design
• G3 pod compatibility for cost savings

Cons:

• Small screen and button may be inaccessible for some users
• Limited wattage customization
• Occasional pod resistance detection issues
• Power mode differences may feel subtle to some users

Final Thoughts: Is the Caliburn G4 Worth It?

The Uwell Caliburn G4 is a stellar addition to the Caliburn series, combining portability, durability, and top-tier flavor in a sleek package. Its 1300mAh battery, adjustable airflow, and dual vaping modes make it versatile enough for both beginners and seasoned vapers. While the PRO-FOCS 4.0 technology ensures every puff is rich and satisfying. Despite minor drawbacks like limited accessibility and subtle mode differences, the G4’s performance and user-friendly design make it a standout in 2025’s.

At Vape Talks, we believe the Caliburn G4 is a worthy investment for anyone seeking a reliable, flavorful, pod system. Whether you’re upgrading from a G3 or diving into vaping for the first time, the G4 delivers a premium experience. Have you tried the Caliburn G4? Let us know your thoughts in the comments below, and stay tuned for more vaping insights from Vape Talks!