Uwell Caliburn G4 Review

The Uwell Caliburn G4 is the latest entry in one of the most respected pod kit lineages on the market, and it plays to that reputation rather than reinventing it. This is a device built around simplicity done exceptionally well: draw-activated firing, a genuinely useful colour screen, and a pod system refined over several generations to be about as leak-proof as this category gets.

The 1300mAh battery is a meaningful step up from the G3 before it, and the 0.85-inch HD screen gives you clear feedback without adding complexity. Combined with dual Storm and Waves vaping modes, the G4 gives everyday vapers a genuine choice in how their device behaves, without ever asking them to touch a wattage dial.

For anyone who wants a compact, no-fuss pod kit that still feels considered and current, the Caliburn G4 is one of the strongest options available right now.

Overview

The Caliburn G4 continues Uwell's approach of small, iterative improvements rather than dramatic overhauls, and in a device this well-established, that is exactly the right strategy. The battery has grown, the screen has improved, the pod technology has matured, and the core experience, pick it up and draw, remains as immediate as ever.

We have carried the Caliburn G4 daily at Ninja Vapes, testing it across nic salts and freebase liquids on both the standard GPP pods and the backward-compatible G3 cartridges. Here is our full assessment of where it excels, and the handful of trade-offs worth knowing before you buy.

What Is in the Box

• 1 x Uwell Caliburn G4 device
• 1 x 0.8ohm Caliburn GPP pod (pre-installed)
• 1 x 0.6ohm Caliburn GPP pod
• 1 x USB-C charging cable
• User manual and warranty card

The G4 ships with two GPP pods covering a sensible middle ground for most vaping styles. It also accepts the older Caliburn G3 cartridges, which is a welcome bit of backward compatibility if you are upgrading from a previous Caliburn device and already have spare pods on hand.

Build and Design

The Caliburn G4 is built on an aluminium-alloy chassis and measures roughly 115 x 26 x 15.65mm, keeping it firmly in compact, pocket-friendly territory. The device carries the same understated, ergonomic shape Uwell has favoured across the Caliburn range, and it sits naturally in the hand during longer sessions.

The 0.85-inch HD colour screen is a clear improvement over earlier Caliburn generations. It displays battery life, puff count, and the active vaping mode clearly, and supports both day and night display settings so it stays legible in different lighting. Dynamic UI themes let you personalise the look without adding any real complexity to how the device operates.

Airflow is adjusted via a control at the base of the device, offering a genuinely wide range from tight MTL through to a more open, airy draw. It is a simple mechanical adjustment rather than anything digital, which keeps the device intuitive even with the added screen.

Battery Life

The 1300mAh battery represents a solid step up from the Caliburn G3's smaller cell, and in daily use it holds up well. Moderate vapers running the 0.8ohm pod at typical settings will comfortably get through a full day, and lighter users may stretch it into a second day before needing a charge.

Charging runs over USB-C with 5V/2A fast charging support, which brings the device back to a usable level quickly during a short break rather than requiring a lengthy sit on the charger. The screen gives a clear read on remaining battery at all times, so there are no unpleasant surprises.

Unlike some of its rivals, the Caliburn G4 does not offer manual wattage adjustment. Output is fixed at up to 35W and shaped instead by the two vaping modes, Storm and Waves, which alter how power is delivered rather than letting you set a specific number. This is a deliberate simplicity trade-off, and one that suits the device's overall philosophy.

Performance

Storm Mode is the punchier of the two settings, delivering a quicker, more immediate hit that suits vapers who want a bolder throat hit and faster vapour production. Waves Mode softens that delivery into something steadier and more consistent, better suited to long, relaxed sessions where you want the flavour to stay even from the first draw to the last.

The GPP pods benefit from Uwell's PRO-FOCS 4.0 flavour technology, and the difference is noticeable. Flavour clarity through the 0.8ohm pod is excellent for an MTL-focused device, and the 0.6ohm option opens things up nicely for vapers who prefer a slightly airier draw without moving into full sub-ohm territory.

Activation is draw-only, with no fire button at all, which keeps the experience as immediate as possible. The draw sensor responds instantly and consistently, and there is no perceptible delay between inhale and vapour production, a hallmark of the Caliburn line that the G4 maintains.

Pod Compatibility

The Caliburn G4 uses the upgraded GPP cartridge system, which holds 3ml of e-liquid and fills via a side-fill port rather than needing the pod removed. U² anti-leak technology is applied throughout, and in testing the pods held up well even during travel and pocket carry, a longstanding strength of the Caliburn range.

Usefully, the G4 remains backward compatible with Caliburn G3 pod cartridges, which is a meaningful convenience for anyone upgrading from the previous generation rather than starting from scratch. Resistance options across the GPP range span from 0.4ohm to 0.9ohm, covering a solid spread of MTL and lightly restricted DTL styles.

Both nic salts and freebase e-liquids work well across the pod range, with the 0.6ohm and 0.8ohm options in particular striking a good balance between flavour and vapour for everyday nic salt use.

Ease of Use

This is where the Caliburn G4 is at its strongest. There is no wattage to set, no menu to navigate beyond switching between Storm and Waves, and no learning curve to speak of. Pick it up, draw, and the device does the rest. For anyone new to vaping, or anyone who simply wants a device that gets out of the way, this is about as straightforward as a feature-rich pod kit gets.

Pod changes are quick thanks to the magnetic connection, and the side-fill system means you can top up e-liquid without removing the pod from the device, a small but genuinely useful convenience during day-to-day use.

Pros and Cons

What We Liked

• Excellent flavour delivery through the upgraded GPP cartridge and PRO-FOCS 4.0 tech
• Genuinely useful 0.85-inch HD colour screen with day/night display modes
• 1300mAh battery comfortably covers a full day for most vapers
• Storm and Waves modes offer real variety without added complexity
• Backward compatible with Caliburn G3 pods
• Side-fill system means no need to remove the pod to top up
• U² anti-leak technology genuinely holds up in daily carry
• Fast USB-C charging at 5V/2A

Worth Knowing

• No manual wattage adjustment, output is fixed and mode-based only
• 35W ceiling is modest next to higher-output rivals
• Draw-only activation won't suit vapers who prefer a fire button
• Resistance range tops out at 0.9ohm, so dedicated sub-ohm vapers should look elsewhere

How It Compares

The Caliburn G4 sits in the simplicity-first corner of the pod kit market. Here is how it stacks up against two established rivals.

The Caliburn G4 wins on screen quality and sheer ease of use, and its flavour delivery holds up well against both rivals despite lacking manual wattage control. The Xlim Pro offers finer airflow adjustment, while the XROS 5 edges ahead on battery capacity and offers a fire-button option for those who want it.

Quick Specifications

Frequently Asked Questions

Q1. Is the Uwell Caliburn G4 good for beginners?

Yes, arguably more than most devices on the market. There is no wattage to configure and no fire button to learn, you simply draw on the device and it fires automatically. The colour screen keeps you informed without requiring any navigation, making this one of the most approachable pod kits currently available.

Q2. What pods are compatible with the Uwell Caliburn G4?

The G4 uses Uwell's upgraded GPP cartridges, available in resistances from 0.4ohm to 0.9ohm, and remains backward compatible with Caliburn G3 pod cartridges. The kit includes 0.6ohm and 0.8ohm GPP pods as standard.

Q3. How long does the Caliburn G4 battery last?

The 1300mAh battery comfortably covers a full day of moderate use, and lighter vapers may get closer to two days between charges. USB-C charging at 5V/2A brings the device back up quickly, so a short break is usually enough to top up meaningfully.

Q4. Can I use nicotine salts in the Uwell Caliburn G4?

Yes, the G4 is well suited to nic salts, particularly through the 0.8ohm pod, which delivers a smooth throat hit and clear flavour at typical nicotine strengths. Freebase e-liquid also performs well, especially through the airier 0.6ohm option.

Q5. What is the difference between Storm and Waves mode?

Storm Mode delivers a punchier, more immediate hit suited to quick, bold draws, while Waves Mode smooths the power delivery for a steadier, more consistent puff throughout a longer session. Switching between the two takes seconds and lets you tailor the device to your mood without touching a wattage setting.

Review by

Ninja Vapes Expert Team on Aug 21, 2026

Team Ninja Vapes are UK-based vaping specialists, based in Preston, Lancashire, with over a decade of experience in the vape industry. From first-time starter kits to advanced pod systems, the team personally tests every product they review - evaluating real-world performance, flavour quality, build, and value. Their mission is simple: honest, expert reviews that help vapers across the UK find the right kit, every time.