Innokin Endura T20-S Vape Starter Kit Blue

Overview

The Innokin Endura T20-S Vape Starter Kit Blue by Innokin in Blue at 0mg. Free UK delivery over £20, same-day dispatch on weekday orders before 4pm.

Innokin Endura T20-S Vape Starter Kit overview

The Innokin Endura T20-S is a refillable pen-style starter kit built for people who want a straightforward, low-maintenance way to vape without relying on disposables. It pairs a slim internal-battery body with a top-fill tank and replaceable coils, so you buy the device once and then only pay for e-liquid and the occasional coil. Innokin has been making hardware for well over a decade, and the Endura line is its long-running entry-level family, aimed squarely at ex-smokers and first-time vapers who value simplicity over tweakability.

The T20-S sits in the middle of that family. It is a step up in battery capacity from the smaller T18-style pens, yet it keeps the same no-fuss approach: fill the tank, wait a few minutes for the coil to soak, and draw. There is no wattage screen, no menu structure and no temperature setting to second-guess. That design choice is deliberate. People switching from cigarettes often give up on vaping because the first device they try asks them to learn too much, and the T20-S avoids that trap.

This matters more in the UK than it did a few years ago. Single-use vapes were banned from sale across Great Britain and Northern Ireland from 1 June 2025, which pushed a large number of former disposable users towards rechargeable kits. A refillable pen like the Endura T20-S is exactly the kind of product that replaces a drawer full of discarded plastic with one device that lasts for months. It also lets you choose your own e-liquid and nicotine strength, which a disposable never did.

In this guide we cover the specifications, how the kit performs, what the coil and tank do for flavour, how to look after the battery, which nicotine strength to pick, who the kit suits and who should look elsewhere, how to set it up, what to do when things go wrong, how the running costs stack up and how it compares with other common starter kits. We have tried to be straightforward about limitations as well as strengths, because a starter kit is only worth buying if it fits the way you actually vape.

All vaping products are for adults aged 18 and over. If you do not currently smoke or vape, there is no reason to start. This kit is intended for adult smokers looking for an alternative to tobacco.

Key specifications at a glance

Specifications for entry-level kits can shift slightly between production batches and regional packaging, so always check the leaflet inside your box. The figures below reflect what Innokin publishes for the Endura T20-S family and what is typical for this class of device.

• Device type: pen-style refillable starter kit with a built-in rechargeable battery
• Battery capacity: 1500mAh internal lithium-ion cell, which is large for a pen of this size
• Tank capacity: 2ml, matching the maximum tank size allowed for nicotine vapes sold in the UK
• Filling method: top-fill through a sliding or lifting cap, so there is no need to unscrew the tank
• Coil system: replaceable Prism S-series coils, with the coil supplied in the box typically being the higher-resistance mouth-to-lung option (check the resistance printed on the coil base)
• Firing: draw-activated, so the coil heats as you inhale
• Output: fixed, with no adjustable wattage or mode menus
• Charging: by USB cable through the port on the device
• Inhale style: mouth-to-lung (MTL), the same tight draw as a cigarette
• Suitable e-liquid: nicotine salt and freebase liquids, ideally 50/50 VG/PG or a PG-leaning blend
• Colour options: several finishes, which are the variants you can pick on this page

Two of those numbers do most of the work. The 1500mAh battery gives the pen a comfortable full day of use for most people, and the 2ml tank means you will refill more often than you would with a larger device. That trade-off is baked into UK rules: refillable tanks for nicotine e-liquid cannot exceed 2ml and bottles cannot exceed 10ml, so every starter kit sold legally in the UK shares the same small reservoir.

The kit does not include e-liquid, so you will need to buy a bottle separately. Nicotine e-liquid in the UK is capped at 20mg/ml (2%), which is the same ceiling that applied to disposables before they were banned.

Performance and vapour delivery

The T20-S is a mouth-to-lung device, and that shapes everything about how it performs. In a mouth-to-lung setup you draw vapour into your mouth first, pause briefly, and then inhale. The airflow is restricted on purpose so the draw feels tight and the vapour is concentrated, much like pulling on a cigarette. If you are used to large cloud-chasing tanks, this will feel modest by comparison. That is not a flaw; it is the point of the design.

With a 1.5 ohm-class coil and a fixed output, the pen produces warm, moderate vapour. Throat hit is the main sensation, and it is closely tied to your nicotine strength and the PG content of your liquid. A 50/50 liquid at 10mg or 20mg nicotine salt delivers a noticeable but smooth hit. Higher VG liquids soften the throat hit and increase vapour volume, though very thick liquids can struggle to wick through a small coil, which we cover in the troubleshooting section.

Draw activation helps with consistency. The coil only fires while you inhale, so there is no risk of leaving a button held down and dry-burning the cotton. The sensor on a pen like this is generally reliable once the coil is primed. Where you may notice differences is on the first few draws after refilling, when the cotton is still absorbing liquid. Give it a few minutes and take a couple of gentle priming draws without firing hard, and the output settles into a steady pattern.

Puff counts are the number everyone asks about, and it is worth being clear that refillable devices are not rated in puffs the way disposables are. What matters is the e-liquid volume and your habits. A 2ml tank holds roughly the same amount of liquid as a typical 600-puff disposable, and a mouth-to-lung pen is economical enough that many people get a similar number of puffs from each fill. Light users might fill once a day. Heavier users, particularly those swapping from a pack a day, may top up two or three times between waking and bedtime.

One honest limitation: because the output is fixed, you cannot turn the T20-S up if a liquid feels thin or down if it feels harsh. You adjust by changing your liquid instead, which is why the nicotine and VG/PG guidance later in this guide is worth reading before your first order.

Coil, tank and flavour profile

The Endura T20-S uses Innokin's Prism S-series coil system. Coils are the consumable heart of any refillable kit: a small head containing cotton wicking and a heating element that vaporises the liquid. Innokin makes these as self-contained units that press into the tank base, so replacing one takes seconds and no tools are required. You will not be building coils or wrapping wire, which is exactly what a beginner kit should offer.

The coil that ships in the box is geared towards a tight, cigarette-like draw. Resistance in this class sits around the 1.5 ohm mark, which matches the output of the battery to deliver warm rather than hot vapour. A higher resistance means less power reaches the cotton, so the temperature stays moderate and flavour tends to stay clean and recognisable instead of being washed out. Lower-resistance Prism S options exist in the wider range for people who want warmer vapour and a looser draw, so it is worth checking the pack size and resistance when you order replacements.

Flavour is the area where the T20-S punches above its price. Because the vapour is concentrated and the coil runs at a modest temperature, fruit, menthol, tobacco and dessert profiles all come across with reasonable definition. Tobacco and menthol liquids in particular tend to suit this style of coil well, since the tight draw replicates the sensation many smokers are looking for. Very sweet dessert liquids can leave residue on the coil faster, which shortens its lifespan. If you love sweet profiles, plan to change the coil a little more often.

The tank itself is a simple polycarbonate or similar window design that lets you see the liquid level at a glance. The airflow is fixed, so there is no adjustable ring to tune. For a mouth-to-lung device this is fine, because the tight airflow is what makes the vape feel right in the first place.

Some practical points on coil life:

• Expect roughly one to two weeks per coil with regular use, depending on liquid sweetness and how often you vape.
• Gurgling, a burnt taste or muted flavour are the usual signs a coil has reached the end of its life.
• Always prime a fresh coil by dripping a few drops of liquid into the wicking holes before filling the tank.
• Rinse the tank with warm water and dry it when you change a coil, so old residue does not affect the new one.

Design and build quality

The Endura T20-S is a slim, rounded pen that fits comfortably in a jacket pocket or the small compartment of a bag. The body is slightly thicker than a standard cigarette but noticeably slimmer than most pod mods. With the battery tucked inside the main housing, the overall proportions feel balanced in the hand, and there are no sharp edges or fiddly protrusions to catch on clothing.

Innokin has a reputation for solid mid-market build, and the T20-S reflects that. The body uses a lightweight metal or coated finish depending on the variant, with a smooth surface that resists everyday scuffs reasonably well. Over weeks of regular use you will see minor wear around the base and where the tank meets the battery, which is normal for any pocket device. The coating is not scratch-proof, so keeping the pen in a separate compartment from keys and coins is sensible.

The threading and tank fit deserve a mention. A common weakness in budget kits is a loose tank connection that leaks or rattles. On the Endura line the tank seats firmly onto the body, and the coil press-fit holds without wobble when installed correctly. If a tank ever leaks from the base, the first thing to check is that the coil is pushed fully home and the silicone seals are sitting flat, rather than assuming the device is faulty.

The top-fill cap is one of the better design decisions on this kit. Instead of unscrewing the tank and risking spills, you open the cap, drip liquid into the fill port and close it again. It is worth noting the fill port is small, so use a bottle with a narrow nozzle, which UK-sold nicotine bottles generally have. Avoid squeezing too hard, and fill slowly to avoid pushing liquid into the central chimney, which can cause gurgling or leaking.

Variants on this product page differ by finish and colour rather than by function. Every option uses the same battery, tank and coil system, so pick the one you like the look of. There is no performance difference between colours, and replacement coils are universal across all of them.

Weight is modest, which makes the device easy to carry all day. If you have smaller hands, the slim barrel is more comfortable than boxy pod mods, and the rounded profile suits a loose, relaxed grip.

Battery life and charging

The 1500mAh internal battery is the headline feature on the T20-S, and in everyday use it is more than the tank can usually exploit. A 1500mAh cell feeding a modest-resistance coil at a fixed output typically lasts a full day for most people, and often into a second day for lighter users. The 2ml tank is the more likely limit: you will probably refill several times before the battery runs out.

Charging is done over USB with the cable supplied in the box. Plug it into a phone charger or a laptop port, and the device will charge while you are doing something else. From fully flat, expect a charge time of roughly one and a half to two hours on a typical 1A source, and a little longer on a low-power computer port. An indicator light on the device shows charge status, so you can see when it is done. Check the leaflet in the box for the specific colour codes your unit uses.

A few habits will keep the battery healthy:

• Use a reputable phone-style charger rather than a cheap unbranded adapter. Poorly made chargers are the leading cause of battery faults on vaping devices.
• Do not leave the pen charging unattended overnight on a soft surface such as a bed or sofa.
• Avoid letting the battery sit completely flat for long periods, as lithium-ion cells dislike deep discharge.
• Do not use the device while it is plugged in unless the manufacturer states it is safe to do so.
• Keep it out of direct sunlight, hot cars and freezing conditions.

Because the battery is built in, you cannot swap a spare cell when it runs flat. If you vape heavily, plan to top up during the day or keep a short USB cable and power bank in your bag. A quick 20 minute charge will typically give you several hours of light use.

At end of life, which for a well-treated cell is usually a year or more of daily use, do not put the device in your household bin. Lithium-ion batteries cause fires in bin lorries and recycling centres. Under UK waste rules, retailers that sell vaping equipment must offer take-back, and many council recycling centres and supermarket drop-off points accept small electricals and vapes. Search for a nearby vape recycling point and drop the entire device in, with any remaining e-liquid left in the tank.

Nicotine strength and e-liquid choice

Choosing the right nicotine strength is the single biggest factor in whether a first starter kit works for you. In the UK, nicotine e-liquid is limited to 20mg/ml (2%) in bottles of up to 10ml. That ceiling applies whether you buy freebase liquid or nicotine salts, and there is nothing stronger available to buy legally.

The T20-S is a mouth-to-lung pen with a modest-wattage coil, so lower to mid-range strengths tend to give a comfortable experience. As a rough starting guide:

• Heavy smokers (20 or more cigarettes a day): try 18mg to 20mg nicotine salt, or 12mg freebase if you prefer a harsher throat hit.
• Moderate smokers (10 to 20 a day): 10mg to 12mg nicotine salt, or 6mg to 9mg freebase.
• Light or social smokers: 3mg to 6mg freebase or 5mg to 10mg nicotine salt.
• Existing vapers stepping down: start at your current strength and reduce gradually once you feel settled.

Nicotine salts are smoother at a given strength and deliver nicotine quickly, which many ex-smokers find satisfying. Freebase nicotine gives a sharper throat hit and tends to be better value. Both types work well in this pen. If you pick a nicotine salt at 20mg and find it too strong, step down to 10mg rather than assuming the kit is the problem. Starting too high is the commonest reason beginners feel lightheaded or nauseous.

For VG/PG ratio, a 50/50 blend is the safest all-round choice. It wicks well through a small coil, gives a decent throat hit and produces a moderate amount of vapour. PG-leaning liquids intensify flavour and throat hit; VG-leaning liquids are smoother and thicker. Avoid very high VG blends (such as 70/30 or higher) in this pen, because the thicker liquid struggles to wick fast enough through a higher-resistance coil, which can cause dry hits and a burnt taste.

Shortfill bottles are generally too large and too low in nicotine for this kind of device, since you would need to add a nicotine shot and mix them. Stick with ready-to-use 10ml bottles for simplicity. Always store e-liquid out of reach of children and pets, and never swallow it or let it touch your skin for prolonged periods.

Who the Endura T20-S is for

Every vape is a set of compromises, and the Endura T20-S makes sensible ones for a specific kind of user. Here is where it fits well.

• Smokers moving over from cigarettes: the tight, mouth-to-lung draw feels familiar, and the fixed output means there is nothing to configure.
• Former disposable users: if you were buying a disposable every few days, a refillable pen with a rechargeable battery is the natural next step, and the running costs are much lower.
• First-time refillable users: the top-fill tank and press-in coils are about as simple as refilling gets.
• People who value portability: the slim body travels easily and does not draw attention.
• Anyone wanting a backup device: because the kit is inexpensive, many vapers keep one as a second device for travel or for days when their main setup is out of action.

It is less well suited to some people, and being upfront about that saves frustration.

• Cloud chasers: if you want large, dense plumes of vapour, you need a sub-ohm device with big airflow and a high-VG liquid. The T20-S is not built for that.
• Tinkerers: there is no wattage control, no replaceable battery and no rebuildable deck. If you enjoy adjusting your setup, you will outgrow it quickly.
• Very heavy users: a 2ml tank means frequent refills. Someone getting through a lot of liquid every day may find constant topping up a nuisance.
• Non-smokers and under-18s: vaping is not intended for people who do not already use nicotine, and it is illegal to sell vaping products to anyone under 18 in the UK.

If you are unsure which camp you are in, start with the draw type. If you currently smoke cigarettes and want something that feels similar, you are likely in the right place. If you used large clouds on a different device and miss them, look at a sub-ohm kit instead. Local vape shops and stop-smoking services can also advise on switching, and the NHS offers free support to people trying to quit tobacco.

How to set up and use the kit

Getting the Endura T20-S working takes about five minutes if you follow the steps in order. Rushing the first fill is the main reason new users end up with burnt coils, so be patient with the priming stage.

• Step 1, charge it. Plug the USB cable into the device and a power source, and let it charge fully before first use. A full first charge helps the battery settle.
• Step 2, check the coil. Make sure the supplied Prism S coil is pushed firmly into the tank base. If it is already installed, confirm it is seated flat without gaps.
• Step 3, prime the coil. Place two or three drops of e-liquid directly into the small wicking holes on the side of the coil head. This soaks the cotton and protects it from dry burning on the first draws.
• Step 4, fill the tank. Open the top-fill cap and add liquid slowly into the fill port, staying below the maximum line. Avoid dripping into the central chimney tube.
• Step 5, wait. Leave the pen upright for at least five minutes, ideally ten, so the liquid soaks fully into the coil.
• Step 6, take gentle first draws. Inhale slowly for a couple of seconds without inhaling into your lungs, and wait a few seconds between draws. The vapour will build up as the coil warms.

For everyday use, take slow, steady draws of two to four seconds. Mouth-to-lung means you hold the vapour in your mouth for a moment and then inhale. Short, sharp pulls will give you a weaker flavour, and holding the draw too long can overheat the coil.

When refilling, try to top up before the tank is completely empty. Running a coil on a nearly dry wick is the fastest way to shorten its life. If you taste any burnt notes, stop and check the liquid level.

For cleaning, wipe the mouthpiece and the battery connection with a dry cloth. Do not submerge the battery body in water. Rinse the tank and its parts under warm water every couple of weeks, allow them to dry completely, and then reassemble. If you travel by air, keep the tank empty or the fill cap closed firmly, since pressure changes can push liquid out of the airflow channel.

Troubleshooting common problems

Most problems with a pen kit come down to a short list of causes, and most are fixable in a minute or two. Work through the issues below before assuming something is faulty.

• Burnt or acrid taste: usually a dry or worn coil. Check the liquid level, prime a fresh coil properly, and avoid long chain draws. If the taste persists after a new coil, switch to a thinner liquid.
• Gurgling or spitting: too much liquid in the chimney, or condensation. Blow gently back through the mouthpiece to clear it, and wipe away any liquid.
• Leaking from the base: the coil is not fully seated, the silicone seals are folded, or the tank was overfilled. Disassemble, wipe the parts dry, reseat the coil and refill to just below the maximum line.
• Weak vapour or muted flavour: the coil is reaching the end of its life, or the liquid is too thick. Replace the coil and consider a 50/50 liquid.
• Device does not fire: check the battery charge and clean the connection between the tank and the body. If the indicator light flashes when you inhale, consult the leaflet, as the pattern identifies the fault.
• Dry hits when the tank is not empty: the coil is not wicking fast enough. Prime again, wait several minutes and try a thinner liquid.
• Charging does not start: try a different cable and power source. Check that the port is free of dust or lint, which you can gently remove with a wooden toothpick.

If you experience a persistent fault that cleaning and a new coil do not resolve, stop using the device and contact the retailer. Never keep using a vape that overheats, swells or smells of burning. Swollen or damaged batteries must not be charged; take them to a proper electrical-waste recycling point.

Faulty goods are covered by UK consumer law, and Innokin products typically carry a manufacturer warranty on defects. Keep your order confirmation so you have proof of purchase, and photograph the fault before contacting support. Many apparent faults are actually user-side issues, so if a coil is the cause, you will be able to swap it and carry on without needing a replacement device.

Value for money and running costs

Starter kits have to justify themselves in two ways: the upfront price and the cost of using them over a few months. On both counts the Endura T20-S sits comfortably in the budget end of the market, though it is not the cheapest way to start.

The upfront cost is the kit itself, which usually lands in the low-to-mid teens or twenties of pounds depending on promotions. Even at the top of that range, it is a sensible price for a pen with a 1500mAh battery and a refillable tank. Compare that with buying disposables: a single disposable used to cost around five or six pounds and lasted only a few days for a regular user, so a rechargeable kit paid for itself within a fortnight.

Running costs break down into three parts.

• E-liquid: a 10ml bottle typically costs a few pounds and, for a light-to-moderate user, lasts several days to a week or more. This is the largest ongoing expense.
• Coils: a pack of Prism S coils generally costs a few pounds and will cover a month or two at one coil every one to two weeks.
• Electricity: negligible. Charging a 1500mAh battery costs a fraction of a penny.

Put together, a regular vaper using this kit can expect to spend noticeably less per week than they would on cigarettes or repeat disposable purchases. Exact savings depend on how much you smoked and how much you vape, so use your own figures rather than relying on a general claim. Your local stop-smoking service can help you work out a realistic budget.

The kit also holds value as a device because it has no proprietary pod to buy. Replacement coils are standard Prism S units, and the tank, cap and seals are widely stocked, so you are not locked into a single flavour range. Compared with closed-pod systems where each cartridge is tied to one brand, an open refillable tank gives you access to hundreds of e-liquids at competitive prices.

Where it gives up some value is longevity of the battery, which is sealed in. After a year or two of daily use, capacity will fade, and since you cannot swap the cell, you may choose to replace the whole kit. At this price that is a reasonable outcome, but it is worth knowing in advance. When the time comes, recycle the old device at a proper drop-off point rather than binning it.

How it compares with other starter kits

The starter-kit market is crowded, and the right choice depends on what you value. Here is how the Endura T20-S compares fairly with the types of device people usually cross-shop it against. We have kept the comparisons to broad categories, because specifications and prices change from model to model.

Versus closed-pod kits (such as Caliburn-style or Novo-style pods). Closed pods are simple and clean to use, with pre-filled or refillable cartridges that click in. They are slightly more compact and can feel more modern. The downside is that replacement pods are often priced higher than loose coils and may be tied to one manufacturer. The T20-S needs more hands-on refilling but gives you access to far more e-liquid options and typically lower per-week running costs.

Versus larger-battery pod mods (such as Xros-style kits). Pod mods around the 1000mAh range with fixed or adjustable output are capable alternatives, and some offer a choice of coil resistance and larger airflow control. They tend to cost a little more. If you want to experiment with different draw styles, these are worth a look. If you simply want a reliable cigarette-style draw, the T20-S does the job with a larger battery and less to learn.

Versus smaller pen-style kits in the same Endura family. Smaller models offer a slimmer profile and a lower price but less battery life. If you carry a charger and vape lightly, the smaller pens are fine. For day-long use without a top-up, the T20-S's larger cell is the more practical option.

Versus sub-ohm starter kits. These are aimed at a different vaper: lower-resistance coils, big airflow, high-VG liquid and much larger vapour production. They are less discreet, use more liquid and usually need lower nicotine strengths. They are worth considering only if you already know you want a lung-hit vape.

Versus disposables. With disposables banned in the UK from June 2025, this is largely a historical comparison. Even setting that aside, the refillable kit offers lower running cost, better flavour variety and far less waste.

The honest summary is that the Endura T20-S does not try to be the most powerful or the most compact device in any category. It earns its place by being dependable, simple to run and sensibly priced, with a battery capacity that comfortably covers a full day. For a smoker who wants to switch without a learning curve, that combination is hard to fault.