The Uwell Caliburn A2 is a refillable, rechargeable pod kit — 15W, a 520mAh battery and 2ml pods you fill with your own e-liquid and recharge over USB-C. Since the UK banned single-use disposables on 1 June 2025, it has become one of the simplest 'what do I buy now?' answers for ex-disposable vapers. It is draw-activated, pocket-sized, and has no buttons or settings to learn. Here is everything you need, from a team that has sold thousands of them.
The Caliburn A2 in 60 seconds
- Type: refillable pod kit (not a disposable — still fully legal in the UK).
- Power: 15W fixed, draw-activated. No fire button, no menus.
- Battery: 520mAh, USB-C charging — roughly a full day for most vapers.
- Pods: 2ml refillable, 0.9Ω mesh coil built in. Tight MTL (cigarette-style) draw.
- Best with: 10–20mg nic salt e-liquid.
- VOS price: £12.99 with a free 10ml e-liquid included.
Is the Uwell Caliburn A2 a disposable or a refillable kit?
It is a refillable, rechargeable kit — and that distinction now matters more than ever. Since 1 June 2025 it has been illegal for UK shops to sell single-use disposable vapes. The Caliburn A2 is exactly the kind of device the law still allows: you recharge the battery over USB-C and refill the pod yourself, so nothing gets thrown away after one use. If you are replacing a banned disposable, this is one of the easiest switches to make. We cover the full rules in our UK disposable vape ban guide, and you can browse other disposable vape alternatives if you want to compare.
Uwell Caliburn A2 full specs
Here are the verified specifications, taken from Uwell's official product page. Note: the A2 is a fixed-power, draw-activated device — it does not have variable voltage or adjustable wattage, despite what some older listings claim.
| Specification | Detail |
|---|---|
| Output power | 15W (fixed) |
| Battery | 520mAh built-in |
| Charging | USB-C |
| Pod capacity | 2ml refillable |
| Coil | 0.9Ω UN2 Meshed-H (built into pod) |
| Firing | Draw-activated (no button) |
| Draw style | MTL (tight, cigarette-like) |
| Dimensions | 110.1 x 21.3 x 11.7mm, 31g |
| Colours | 9 options |
How do you fill the Caliburn A2 pod?
Filling takes about ten seconds and you do it from the side of the pod, not the bottom. Here is the process:
- Pull the pod out of the battery (it is held by magnets).
- Lift the rubber bung on the side fill port.
- Insert your e-liquid nozzle and fill slowly to just below the max line — 2ml.
- Push the bung firmly back in and click the pod back into the device.
- Wait 5 minutes before the first vape so the coil soaks. This single step prevents most 'burnt' first pods.
One honest tip we give every customer: a brand-new pod always tastes its best on day one. When flavour starts to dull or tastes slightly scorched, the coil inside the pod is spent — swap the whole pod rather than pushing it.
How long does the Caliburn A2 battery last and how do I charge it?
The 520mAh battery comfortably lasts a light-to-moderate vaper a full day, and you top it up over USB-C. It is a smaller battery than chunkier pod mods, which is the trade-off for how slim and light the A2 is. If you are a heavy all-day vaper, expect to charge once during the day — or look at the bigger-battery options in the comparison below. An LED on the device shows charge status, and there is low-voltage protection so it will not over-discharge.
Which pods does the Caliburn A2 use?
The A2 uses Uwell's 2ml Caliburn A2 pods with a 0.9Ω mesh coil built in — there is no separate coil to screw in, you simply replace the whole pod when the flavour fades. A pod typically lasts most vapers one to two weeks. Stock up with a pack of Uwell Caliburn A2 replacement pods (four per pack) so you are never caught short. Note the A2 pod is its own shape — A2S, G2 and G3 pods are not cross-compatible, so check the model name before buying.
What are the best e-liquids for the Caliburn A2?
Because the A2 is a tight MTL device with a 0.9Ω coil, it is built for nic salts at 10mg or 20mg, in high-PG or 50/50 blends — not thick high-VG cloud juice. That is also the strength most ex-disposable vapers want. Popular pairings from our shelves include SKE Crystal Salts, Elfliq (the Elf Bar salt range), Lost Mary salts and IVG nic salts — all of which mirror the flavours people knew from disposables. Browse the full nic salt e-liquid range to match your old disposable flavour. Avoid 50/50 freebase at high wattage expectations — the A2 keeps things smooth and discreet, not cloudy.
Caliburn A2 vs A2S vs G2 vs G3: which should you buy?
The A2 is the slim, no-frills classic. If you want a bigger battery, airflow control or a screen, one of its siblings may suit you better. Here is how they compare at VOS prices, with the best all-round value highlighted.
| Kit | Battery | Stands out for | VOS price |
|---|---|---|---|
| Caliburn A2 | 520mAh | Slimmest, simplest, best value | £12.99 |
| Caliburn A2S | 520mAh | Adjustable airflow, cheapest | £9.99 |
| Caliburn G2 | 750mAh | Bigger battery, replaceable coils | £18.99 |
| Caliburn G3 | 900mAh | Screen, airflow dial, longest life | £19.99 |
Want the slimmest everyday carry? Take the Uwell Caliburn A2 Pod Kit. Want airflow control on a budget? The Caliburn A2S is £9.99. Heavy vaper who wants the most battery and a screen? Step up to the Caliburn G3. See the full range in our Uwell vape kits collection, or read our best Uwell vapes guide for the full ranking.
Caliburn A2 pros and cons
Pros: genuinely pocketable and light; dead simple — no buttons or settings; excellent flavour from the 0.9Ω mesh pod; cheap to run; USB-C charging; nine colours.
Cons: the 520mAh battery is modest for heavy users; no airflow adjustment (it is fixed MTL); you replace the whole pod rather than just a coil, which costs a little more over time.
Who it is NOT for: if you want big clouds, a loose airy draw, or all-day battery without charging, the A2 is the wrong kit — look at the G3 above or a larger pod mod instead. The A2 is built for discreet, cigarette-style vaping, and it is excellent at that one job.
How much is the Caliburn A2 and where can I buy it in the UK?
At VOS the Caliburn A2 kit is £12.99 and includes a free 10ml e-liquid, so you can vape it the moment it arrives. That is competitive with the major UK retailers, and the free 10ml effectively covers your first bottle. You will occasionally see clearance listings cheaper at smaller sites — just check they are current TPD-compliant stock and not old colours being cleared. Buy direct from the Uwell Caliburn A2 product page (18+ only).
Frequently asked questions
Is the Uwell Caliburn A2 still legal after the UK disposable ban?
Yes. The June 2025 ban only covers single-use disposables. The A2 is rechargeable and refillable, so it is fully legal to buy and use.
Why is my Caliburn A2 tasting burnt?
Usually the pod is dry-firing. Refill it, then wait five minutes before vaping so the coil soaks. If it still tastes scorched, the pod coil is spent — fit a fresh pod.
How long does a Caliburn A2 pod last?
Most vapers get one to two weeks per pod, depending on how much you vape. When flavour fades, replace the whole pod.
What nicotine strength should I use in the Caliburn A2?
10mg or 20mg nic salt suits the 0.9Ω MTL coil best — 20mg if you are coming straight off a strong disposable, 10mg if you want it lighter.
Does the Caliburn A2 have a fire button?
No. It is draw-activated — just inhale on the mouthpiece and it fires automatically. There are no buttons, screens or settings.
Can I use Caliburn G2 or A2S pods in the A2?
No. Each model uses its own pod shape. Always buy pods labelled for the Caliburn A2 specifically.
Final verdict
The Caliburn A2 remains one of the best first refillable kits in the UK: simple, slim, great flavour, and a painless step up from a banned disposable. If you want clouds or airflow control, look elsewhere in the range — but for discreet, low-fuss vaping at £12.99, it is hard to beat. Grab one from our Uwell vape kits collection. 18+ only.
Written by Daniel Bui · Reviewed by Raghu Maroju, Vape Online Store · Last updated 27 Jun 2026 · 8 min read
