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Home » Reviews » Uwell Caliburn Koko Prime Review: I’m In Love With The Koko — Again!

Uwell Caliburn Koko Prime Review: I’m In Love With The Koko — Again!

Uwell Caliburn Koko Prime



Design — 9.0
Build Quality — 10.0
Pod & Coils — 10.0
Performance — 10.0
Flavor — 10.0
Battery Life — 9.0



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Uwell’s Caliburn series of pod vapes have long been some of the most popular vaping devices to date. It all started with the original Caliburn which quickly gained a cult-like following. Next came the Caliburn Koko, a similar device with a different design that was equally adored by vapers.

Since the release of these two pod vape titans, vapers have been patiently waiting for the next iterations of ‘Caliburn’ devices. Uwell has now released the Caliburn G (which I recently reviewed), and the successor to the Caliburn Koko, the Caliburn Koko Prime. 

Instead of replaceable pods, the Caliburn Koko Prime uses the Caliburn G series of replaceable coils and also uses the same pods as the Caliburn G. It has a 2ml eliquid capacity, a maximum output voltage of 15W, and a 690mAh battery.

Box ContentsUwell Caliburn Koko Prime 1

  • 1 x Uwell Caliburn Koko Prime Device
  • 2 x 1.0ohm Caliburn G Coils
  • 1 x Type-C Charging Cable
  • 1 x User Manual
  • 1 x Lanyard


  • Aluminum Alloy Construction
  • Dimensions: 68mm x 45.6mm x 16mm (Including Pod)
  • 2.0ml Refillable Pods
  • 690mAh Battery
  • 15W Maximum Wattage
  • Draw Activated
  • Takes Caliburn G Pods & Coils

Design & Build Quality

  • Uwell Caliburn Koko Prime 2

In terms of pure looks, the Caliburn Koko Prime isn’t radically different from its predecessor. It has been updated and refreshed with a slightly different design but it generally stays true to the look of the original Koko.

The original Koko was small, square shaped and very light. The Koko Prime is nearly identical in size but just a few millimeters wider and thicker at 68mm tall, 45.6mm wide, and 16mm thick. It’s a very small and compact device. 

The biggest design change is the departure from the squared off, flat surfaces on the original Koko to curved and sloped surfaces with the Koko Prime. I think this design looks super modern and just screams ‘upgrade’. If you placed the two devices side by side, it would be instantly apparent which one was the old model and which one was new.

There are six colors available: purple, blue, grey, black, green, and red. Each one has a different color frame, as well as differently colored panels. These panels are magnetic and can be pulled off to be swapped out for another color. Eightvape and a couple of other online vape stores are currently selling these panels separately. 

The hidden back-side of the panels has “Keep On Keeping On”, which is Uwell’s slogan for the Koko Prime. With the panels removed, the front of the device has the Koko logo subtly emblazoned. I really like the look with the panels removed. It’s very stealthy, toned down, and doesn’t scream for attention like the panels do.

There’s a lanyard anchor spot located on the top side of the device, opposite the pod. The lanyard that comes in the box is similarly bright and attention grabbing as the panels with paint splatter, graffiti writing, and Koko and Uwell logos. The lanyard is really well made and super convenient to use. It clips closed at the neck to make putting it on or taking it off easy, and features a guide to tighten or loosen it around your neck. It also has a quick detach clip near the device for if you want to remove the Koko Prime from the lanyard. This is definitely the most convenient, most well thought out, and most useful vape device lanyard that I’ve used.

The pod is the exact same as the one for the Caliburn G. It clicks into place and has a rounded shape that makes it comfortable to vape on. When the pod is installed there are windows on the side of the Koko Prime that allow you to easily check your remaining ejuice.The pod holds 2ml of eliquid and takes Caliburn G replaceable coils. In the box with the Koko Prime you get two 1.0ohm Caliburn G coils.

How to use the Caliburn Koko PrimeUwell Caliburn Koko Prime 5

Even for a complete beginner to vaping, the Koko Prime is a quick and easy device to get started with. It takes replaceable coils so you will want to make sure that you prime the coils properly before vaping. Otherwise, it’s a straightforward device to use.

First, remove the coil that comes pre-installed in the pod by pulling it out. Take your ejuice of choice and drop a few drops of eliquid onto the cotton on the sides of the coil. After you’re done, take the coil and insert it back into the pod by lining up the flat edge with the flat edge on the bottom of the pod. The coil simply pushes back into the bottom of the pod.

The black mouthpiece on the pod also serves as the fill cap. Remove it by pushing it front to back or side to side. Because the mouthpiece is slick it can be a pain to remove at first, but once you remove it a couple of times it becomes much easier.

Fill the pod by sticking your ejuice bottle nozzle into the red gasket. Fill the pod up and let it sit for approximately 5 minutes to give the cotton time to absorb all of the ejuice.

Depending on which way you insert the pod you will get either a MTL/loose MTL draw or a tight MTL draw. There’s a small airflow hole on the bottom of the pod, as well as an airflow hole on the side of the Koko Prime. If the pod is inserted with the airflow holes close to each other then you will get the looser MTL draw. If the pod is inserted with the airflow holes farther apart you will get the tight MTL draw. My suggestion is to try both orientations and see which one you like better.

CoilsUwell Caliburn Koko Prime Coil

Instead of replaceable pods the Koko Prime takes replaceable coils. These are new “Caliburn G Series Coils” made specifically for the Caliburn G and Koko Prime. The coils only fit into the bottom of the pod in a specific way which requires you to line up the flat side of the coil with the flat notch on the bottom of the pod and they simply push into place.

Two coils come in the box and both are the same: 1.0ohm Caliburn G Series Coils. There are also 0.8ohm coils available to be purchased separately (these come with the Caliburn G).

Battery Life & ChargingUwell Caliburn Koko Prime 4

Oh how I love to see Type-C charging ports on new devices! The Koko Prime charges from completely dead to a full charge in 40-45 minutes. Being able to fully charge the device in under 45 minutes is huge and adds a ton of useability to the device. Unfortunately It can’t be used while it charges.

The Koko Prime has a higher maximum wattage output than the original (15W vs 11W) so it uses slightly more power, however this is offset by the increased battery capacity (690mAh vs 520mAh). You can expect to vape a pod and a half of ejuice before having to recharge.

When you draw there’s an LED that lights up to indicate your battery level. Green is 60%+, blue is 30-60%, and red is less than 30%. When the battery dies the red light will flash 10 times in a row and refuse to fire.

PerformanceUwell Caliburn Koko Prime 8

The original Koko was just like the original Caliburn, only in a different body. The Koko Prime is similarly just like the Caliburn G, only in a different body. I reviewed the Caliburn G very recently and as such, the performance is still fresh in my mind. There’s very little difference between the two devices, if any. Which one you get is going to come down to which look you like better. For those who haven’t read my Caliburn G review or who haven’t used the Caliburn G, I’ll go in depth on the performance of the Koko Prime for you.

One big thing to talk about is the airflow. Depending on how you insert the pod you can get either a loose MTL draw or a tight MTL draw, both of which are significantly more restricted than the draw on the original Caliburn and Koko. I liked the draw of those devices, but always desired for just a slightly tighter draw. If you liked the looser MTL draw that the originals delivered, be aware that the Koko Prime will not give you as loose of a draw.

Flavor is top notch with these coils. Just like the 0.8ohm coils that come with the Caliburn G, these 1.0ohm coils deliver rich, warm and flavorful vapor that beats out the rest of the pod vape competition. The flavor is downright impressive and, with the exception of the Caliburn G which is equally good, better than any other pod vape I’ve tried thus far.

A 3-6mg nicotine ejuice still delivers a nice draw and throat hit, despite being used in such a low powered device. However, nicotine salts are where it’s really at with the Koko Prime. A 35mg nicotine salt ejuice delivers an excellent throat hit that I find is just perfect. It’s a satisfying and smooth draw.

Performance issues have been virtually non-existent. I’ve had no leaking from the coils, but I have had a little bit of condensation build up on the bottom of the coils. Nothing concerning but it’s worth mentioning in this review. Just like when I tested the Caliburn G, I used a 50VG, 65VG, and 70VG ejuice and none of them leaked. These 1.0ohm coils keep up with chain vaping perfectly and I never once came close to a dry hit.

In addition to the fantastic wicking capabilities, coil life is also fantastic. I’ve refilled the pod using a single coil more times than I can count but I believe I’m somewhere around 12 refills. Only recently has the coil started to taste a bit off so I’ll likely end up changing it in the near future.


The Koko Prime is another amazing pod vape from Uwell. It brings the same equally amazing performance as the Caliburn G, only in a different shape with a more colorful design. If the colorful panels aren’t your thing, keep in mind that you can remove them for a less flashy, subtle look.

The only issue with the Koko Prime is that the fill cap is difficult to remove, but it becomes easier with time. Other than this, I can’t find another fault or anything that would prevent me from recommending this device.


Danielle Alhiraki Author Picture

Danielle Alhiraki

Danielle is Versed Vaper’s Senior Editor for Buyer’s Guides. In addition to looking after buyer’s guides, she writes hardware reviews as well as manages our review team. Danielle used to be a pack a day smoker but vaping changed her life for the better. Smoke-free since 2015, Danielle is a huge advocate for tobacco harm reduction and has made it her mission to help other smokers make the switch to vaping. Danielle has reviewed hundreds of vaping products since joining Versed Vaper in 2018. Generally, you'll find her watching Disney movies, binging television series, or showing people pictures of her cats.


  • These things are garbage do not buy. Buy the older version before everything became about money with them. The pods are virtually always leaking because of the coils that they make you buy and these no longer use a USB charging port. GARBAGE, buying this made me quit vaping so thank you Uwell for putting out such an absolute piece of trash.

  • Finally a vape I can put around my neck! Love my caliburn koko prime in purple.
    Thank you, I’ll never misplace my vape again!

  • I have many many uwell vapes and like them all. I hit smoking with them and now having so many in different sizes shapes & colors is pure Fashion Statement.
    Everyone wants to know where I purchase them and if they can try it. My store is Chasin Vapor in Pewaukee, WI.

  • This ‘truth’ person is a dunce, either that or someone associated with a different brand. I think lots of the people that don’t like this or the ‘g’ are just people that don’t know how to use them correctly. We live in an age of rapid judgement but soon that won’t really matter for vapers due to all the bans 🤷‍♀️ so who really cares any more anyway

  • I just picked one up after reading this review. There is one difference that got left out when comparing the original KOKO vs the KOKO Prime: you could hit the original KOKO while charging, the KOK Prime will not fire while charging. It’s a small thing, but kind of annoying. That said, I think the draw is much better on the KOKO Prime. Overall very pleased with the purchase thus far.

    RE: “truth” – I concur with DerelictDerek, this person is talking out of their ass.
    “everything became about money with them” – A 4-pack of KOKO Prime coils are cheaper than a 4-pack of original KOKO pods, so that comment makes zero sense.
    “The pods are virtually always leaking” – I have not experienced this, but I did just buy it. (TBD)
    “the coils that they make you buy” – similar to the pods they “made you” buy with the original KOKO or how car manufacturers force you to buy tires… I have no idea what they’re getting at here.
    “and these no longer use a USB charging port.” – Uh, YEAH they DO. They just changed from the yester-year standard Mini USB to the current standard USB-C.
    “buying this made me quit vaping” – Like back to cigs or nic-free? If the latter, then maybe add a little more sincerity with your “thank you”. If not, I return to my original indictment of anal-oration.

  • Koko Prime is the worse device I’ve bought for vaping. The flavor will literally spray in your mouth even you can taste the bitterness of the liquid. It seems like Uwell is now offering DRINKING E-LIQUIDS rather than smoking one. The worst decision ever to buy Koko Prime. Really disappointed.

  • I totally agree with your detailed review Danielle. The Caliburn Koko Prime Device is a great . I was using the original Uwell Koko and this one is even better. I strongly recommend it. Good job Danielle.

  • I’ve tried every pen going all different makes models sizes caliburn Koko prime the best out there for Style Flavour TasteLooks Performance and street appeal it looks the bees knees and for a packet of 50g tobacco price wise you have got the most trendiest succulent sexy pods out there well done I’m so glad I saw this and bought it No Regrets

  • Truth isn’t all wrong though.

    When Koko Prime does work, it’s great.

    However the cons… I don’t know man.

    – Leaks a shit ton during refill.
    – Min BAR can barely be seen.
    – Leaks a **** ton during refill, forcing me to clean up the mess again and again.
    – I had to find out the solution for the freaking spitting issue… Which comes down to blocking airflow and MTL vaping til it heats up and waiting a few minutes… Then rinse and repeat ’til it stops spitting at your mouth. It will spit though.
    – Leaks a **** ton during refill. Seriously, UWELL should consider selling a replacement pod for the device at a low price cuz it’s design is just too flawed.

    – The mess during refill, oh the ******* mess during refill. That **** has to be SOLVED asap. The spitting issue is ******* bad too.

  • Burnt every juice i put in it even with short unsatisfying drags, constant leaking, and finally just stopped working all together after a few months of owning it. Dont buy