OBC Cotton N/S Coils (Pack of 5) S1

Overview

The OBC Cotton N/S Coils (Pack of 5) S1 by OBC in S1 at 0mg. Free UK delivery over £20, same-day dispatch on weekday orders before 4pm.

OBC Cotton N/S Coils (Pack of 5): what is in the pack and who it is for

OBC Cotton N/S Coils (Pack of 5) is a multipack of replacement coil heads, listed at £1.99 for all five, which works out at just under 40p per coil. They are cotton-wicked coils sold under the OBC name, and they sit in the OBC collection next to a second coil line, the OBC Cotton M Coils (Pack of 5). The listing offers two variants, N1 and S1, and understanding what those two codes mean is the first job before anything goes in the basket.

A coil is the part of a refillable vape that does the actual work. Inside it, a resistance wire or mesh heats up when you inhale, and a cotton wick feeds it e-liquid so that the heat turns liquid into vapour instead of scorching dry material. Batteries and tanks last for months or years, whereas the coil is a consumable that is designed to be swapped. A pack of five is therefore less a one-off purchase and more a small stockpile that covers several weeks of normal use, depending on how heavily you vape and what you put through it.

We want to be straightforward about what we know. The product data for this listing gives us the name, the brand, the pack size, the price and the two variant codes. It does not give a resistance figure, a wattage range or a liquid capacity, so you will not find invented numbers further down this page. Where a figure would help, we describe how coils of this general type behave, and we point you to the printed information on the pack or your device as the final word.

In short, this page is for adults who already run a refillable device that takes this coil style and want a low-cost way to keep it tasting right, and for anyone trying to work out whether the N or S code in the title applies to their kit. If you are still choosing hardware, start with the vape kits range instead and come back for coils once you know what you own. Everything on this site is sold strictly to over 18s.

Reading N1, S1 and the M range without guessing

The title says N/S and the variant selector offers N1 and S1. Coil makers commonly use a letter to identify a fitment family and a number to identify a specific head within that family, so a code like N1 or S1 is a precise instruction about which device the coil belongs in. It is not a flavour, a strength or a colour option. Picking the wrong one is the single most common reason a coil purchase goes wrong, and it is entirely avoidable with two minutes of checking.

The reliable way to confirm your code is to look at what is already in your device. Switch the device off, remove the tank or pod, pull out the old coil head and read any marking on the metal base or the plastic collar. Many heads carry a tiny printed code or a resistance value. If the old packaging is still in a drawer, photograph the back of it, because the code is usually printed there. Your device manual or the manufacturer's site is the third source, and it settles most arguments about fitment.

Do not buy by appearance. Coil heads from different families can look almost identical in a photograph yet differ in thread, base size, wicking-hole position or the way the contacts meet the battery. A head that nearly fits can cause leaks, a failure to fire, a flashing atomizer warning or, at worst, a poor seal that floods the device with liquid. If the head you remove does not match the code you were about to order, stop and ask rather than hoping.

• N1: the first variant on the listing. Choose it only if your existing coil or device documentation points to the N family.
• S1: the second variant on the listing. Choose it only if your existing coil or device documentation points to the S family.
• M range: a separate product, the OBC Cotton M Coils (Pack of 5), not interchangeable with this listing unless your documentation says so.

If you cannot identify what your device takes, send us the device name and a photo through the contact page before ordering. We would much rather answer a question than process a return, and a two-line message saves you a wasted delivery wait.

Cotton wicking and coil construction: what the build tells you

Cotton is the wicking material in these coils, which is the reason for the word in the product name. A cotton wick has to do two jobs at once. It must soak up e-liquid fast enough to keep the heating element wet through a long draw, and it must hold that liquid close to the element without letting it flood through the airflow path. Cotton does both reasonably well, which is why it has been the default wick in mainstream coil heads for years. It also tends to be flavour-neutral, so the taste you get is mostly the liquid rather than the wick.

The heating element itself is where coil designs differ. Round-wire coils wrap a single strand into a spiral, while mesh coils spread the element across a flat or curved screen so more of the wick touches metal at once. Mesh generally warms up quickly and covers more liquid per puff, and round wire is simpler and often cheaper to make. The listing does not say which construction these heads use, and we will not guess. What you can check on arrival is the visible build: the cotton should sit snugly against the element with no loose strands poking out, the wicking holes in the housing should be clear, and any silicone seal or o-ring should be intact and seated evenly.

Pay attention to the base. Contacts that are bent, a collar that wobbles, or a seal with a nick will all show up later as leaking or failure to fire. Reject any head with visible damage and tell us within the returns window, because a coil that arrives damaged will never improve with use. At around 40p a head, quality control is the buyer's best friend: the cost of inspecting five coils for ten seconds each is trivial next to the frustration of a leaking tank.

Cotton does have limits worth knowing. It darkens as residue builds from sweeteners and other additives in the liquid, and a wick that has dried out even briefly can taste burnt for good. That is a fact of life with any cotton coil, not a flaw in this one, and it is why the habits in the fitting and troubleshooting sections below matter as much as the part itself.

Resistance, power and airflow: general rules for any coil like this

Resistance, measured in ohms, is the number most vapers look for first, and it is the main figure missing from this listing. It will be printed on the coil head or the pack, so read it before you set up your device. As general category knowledge, lower resistance coils, typically below 1.0 ohm, are built for open, direct-to-lung draws with larger clouds of vapour and a lower nicotine strength. Higher resistance heads, from around 1.0 ohm upward, usually suit tighter mouth-to-lung draws and nicotine salts. These are broad tendencies across the whole category, not specifications of this product.

Power is the other half of the equation. On a variable device, the manufacturer prints a recommended range on the coil. Staying inside that range is the single most effective way to protect flavour and lifespan. Too little power gives a cool, thin, muted draw. Too much dries the wick faster than the liquid can replace it and shortens the coil's useful life dramatically. On pod systems with fixed output, the device handles this for you, which is a major reason many people prefer them.

If you are on a variable wattage device and unsure where to begin, use this approach.

• Start low: set the power at the bottom of the printed range, not the middle.
• Take a few draws: judge flavour and warmth over several puffs, not a single one.
• Step up gently: increase by small increments until the flavour is full but the draw is not harsh.
• Stop at the first hint of harshness: a scratchy throat or dry, hot taste means you have gone too far, so drop back down.

Airflow matters too. A wide-open airflow ring cools the draw and helps flavour on low-resistance heads, while a more restricted setting suits higher resistance coils. Try one change at a time, so you know which adjustment made the difference.

Choosing e-liquid and nicotine strength to suit the coil

The coil and the liquid are a pair, and mismatching them wastes money. In the UK, nicotine e-liquid is sold in bottles of no more than 10ml, refillable tanks and pods hold no more than 2ml, and nicotine strength is capped at 20mg per ml. Those limits shape every purchase, and they are the reason a pack of cheap coils is so useful: a small tank empties quickly, so the wick gets a lot of wet-dry cycles and wears faster than you might expect.

For strength, think about the draw your coil gives you. Higher resistance, tighter draw setups pair naturally with nicotine salt e-liquids, usually in the 10mg to 20mg range, because salts deliver nicotine smoothly at modest power. Low resistance, big-vapour setups pair better with lower strengths or with short-fill e-liquids, which ship at 0mg in a large bottle with room for nicotine shots if you want to add strength yourself. If you are unsure, the wider e-liquid range lists strengths clearly on each product page. This is general product guidance for adults who already use nicotine and not medical advice.

Viscosity is the quiet variable. Thick, high-VG liquids move slowly through small wicking holes, so a high-resistance head on a low-power setting can starve and give dry hits unless you prime it well and let it rest after filling. Thin, higher-PG liquids wick faster but often taste sharper at the throat. If you notice a wick that never seems to catch up, try a thinner liquid before blaming the coil.

Sweet liquids deserve a note of their own. Heavily sweetened flavours, especially dessert and candy profiles, leave more residue on the cotton and element than fruit or menthol liquids, and that residue is what dulls flavour over days. If you rotate through sweet flavours, expect to change heads a little sooner and consider keeping a pack in the drawer so the swap is a minute's job.

Flavour, vapour and how long a coil keeps performing

A fresh cotton coil, correctly primed, should give you clean, accurate flavour with steady vapour production and no gargling, spitting or harsh edges. The coil does not add taste of its own. What it does is transmit the flavour of the liquid, and a good head transmits it faithfully. The first few days are typically when the liquid tastes closest to the bottle, and over time you should expect a gradual fade rather than a sudden collapse.

The fade curve is useful as a diagnostic. A coil in its prime gives full flavour and a smooth draw. A coil entering its second half gives slightly flatter flavour, and you may find yourself nudging the power up to compensate. A coil near the end tastes muted, sometimes with a faint toasted note, and the draw can feel thinner or hotter. That progression gives you advance warning, so you can swap the head before it ruins a tank of liquid.

Lifespan varies a lot, and we will not promise a number for this product because it depends on your behaviour. Heavy daily use, high power, sweet liquids and chain vaping shorten it. Moderate use, low power, thinner liquids and giving the wick time to soak after a fill extend it. As a planning figure only, plenty of people change a head about every week or two. At one swap a week, a pack of five covers roughly five weeks; at one swap a fortnight, it covers about ten.

One more trick for protecting flavour: if you love a delicate fruit or menthol liquid, avoid switching the same head between strongly different flavours. Cotton holds a faint memory of what passed through it, and a head used for a heavy dessert liquid will leave a trace when you move to something light. With coils this cheap, it can be worth fitting a fresh head when you change to a very different flavour family.

Fitting and priming a new coil, step by step

Fitting a coil takes a few minutes and costs nothing beyond the coil itself. Priming is the part people rush, and it is the reason many new coils taste burnt on the first puff. Work through these steps in order and a head that would otherwise be ruined in an hour will last its full life.

• Step one, power down: switch the device off or lock it, and remove it from the charger.
• Step two, empty the tank: pour out any remaining liquid and wipe the tank dry. On a pod system, remove the pod from the battery section.
• Step three, pull the old head: unscrew or lift the old coil out, depending on your device, and keep it until you have confirmed the new one matches.
• Step four, check the seat: look at the threads, the seal and the base for dirt, residue or a damaged o-ring. Wipe it clean and let it dry.
• Step five, seat the new head: fit it by hand until it is snug. Never force it, and never use tools, because overtightening damages the seal.
• Step six, drip the wick: put a few drops of e-liquid directly onto the exposed cotton through the wicking holes, so the wick is wet before it sees any heat.
• Step seven, fill the tank: fill below the maximum line, remembering the 2ml limit on UK tanks and pods, and avoid blocking the airflow.
• Step eight, rest: wait five to ten minutes so the cotton can saturate fully.
• Step nine, take dry draws: with the device off, take two or three gentle draws to pull liquid through the wick.
• Step ten, start low: fire at the bottom of the power range for the first few puffs, and then adjust.

If you are using the coils section to stock up for more than one device, label each pack with the device name using a marker pen. It sounds fussy, but it stops a drawer of near-identical packets turning into guesswork.

Battery, charging and telling a coil fault from a power fault

The coil is not the battery, and confusing the two is a common source of wasted money. This listing is for coil heads only, so there is no battery capacity or charging time to quote, and we will not invent one. What matters is learning to tell a failing coil from a flat battery before you throw a working head away.

A coil fault usually shows up as a change in taste or feel: burnt or flat flavour, gurgling, leaking or spitting, or a hot, dry draw even with a full tank. A battery fault usually shows up as short run time, a device that will not fire after a few puffs, or weak vapour that improves as soon as you recharge. If your device behaves as normal on a freshly charged battery with a freshly fitted coil, the problem is neither. If it only misbehaves at a low charge, swapping the coil will not help.

Good charging habits protect the whole setup. Use the cable that came with the device, or a reputable replacement of the right type, plugged into a standard USB power source. Charge on a hard, clear surface rather than a bed or sofa, do not leave a device charging unattended overnight, and unplug it once it is full. Keep devices out of hot cars and direct sun. A swollen, hot or damaged battery should be taken out of use and disposed of properly, not charged one more time to see what happens.

When any device reaches the end of its life, do not put it in household bins or kerbside recycling. Lithium batteries can start fires in collection lorries and sorting plants. Take old vapes and batteries to a household waste recycling centre, a battery drop-off point, or a retailer take-back service. The used coil head itself holds no battery, but it is still small metal and cotton waste, so follow your local council guidance for it, and keep it away from children and pets.

Troubleshooting a new coil: burnt taste, leaks, dry hits and gurgling

Most problems with a fresh coil trace back to a short list of causes, and nearly all of them are fixable without buying anything. Work down this list before deciding the coil is faulty.

• Burnt taste straight after fitting: the wick was not primed or has not had time to saturate. Drip liquid onto the cotton, rest the tank for ten minutes, take unpowered draws and restart at low power. A burnt wick rarely recovers, so if the taste persists after two tanks, replace the head.
• Burnt taste after a few days: the power is probably too high, or the liquid is too sweet or too thick for the wicking holes. Drop the power, try a thinner liquid and see if flavour recovers.
• Leaking: check the seal, make sure the head is fully seated, and do not overfill. Overtightening can distort the seal, so back it off and refit it by hand. Store the device upright when not in use.
• Gurgling or spitting: too much liquid in the airflow path. Wipe the base and condensation from the chimney, reduce the fill level and open the airflow slightly.
• Dry hits: the wick is starving. Check the liquid level, avoid chain vaping, lower the power and give the wick a few seconds between draws.
• Flat flavour: an ageing coil or a clogged wick. If it has done its job for a week or two, swap it.
• Device will not fire or shows a coil warning: the head may be poorly seated or the wrong code for your device. Remove it, check the code against your device documentation and refit.

If you have tried these steps and a head still fails inside its first few days, treat it as a possible fault. Keep the pack and any remaining coils, then contact us through the contact page with a short description of what happened and which variant you bought, and we will take it from there.

Value for money: the 40p coil and how it compares with other options

At £1.99 for five heads, these coils cost just under 40p each, which is among the lowest per-coil prices in our coils range. Run a weekly swap and the annual cost is roughly £20 of coils at most, a modest figure beside the cost of the liquid. Cheap does not automatically mean good, but at this price point the risk of trying a pack is small, and the downside is limited to a handful of coins.

Here is how it stacks up against other coil packs on the site, using the prices on each product page today.

• The Eleaf GS Air Series and EC Head Pack of 5 is the same £1.99, so price alone will not decide between them. The deciding factor is which one fits your device.
• The Aspire Nautilus 2s Replacement Coils (5 pack) costs £5.71, around £1.14 a coil.
• The Aspire AF Replacement Coils Pack of 5 costs £9.99, about £2.00 a coil.
• The Caliburn G Replacement Coils by Uwell costs £4.49, and the Nord Pro Coils by SMOK cost £16.99, though both are made for different devices from this listing.

Being fair, the premium packs above are not wasted money for the people who use them. A device manufacturer's own coil is built to the exact tolerance of that device, and some owners prefer to stay with first-party parts for that reason. We have no test data showing these OBC heads last longer or shorter than any of those, so we will not claim they do. What we can say is that, for a device that takes this style of head, the per-coil saving is large, the pack is small, and you can learn how they perform in your own setup for the price of a sandwich.

Fitment still beats price every time. A coil that costs £10 and fits is better value than a coil that costs 40p and does not. If you buy several things at once, the vape deals page is worth a look, because delivery over £20 is free and small orders like this are easy to top up.

Who these coils suit, and who should skip them

These coils make sense for a fairly specific buyer, and being honest about that saves everyone time. Read through both lists before you order.

• Good fit: adults who already own a refillable device taking an N or S style head and want an inexpensive spare supply.
• Good fit: vapers who change flavours often and like to fit a fresh head to keep each liquid tasting clean.
• Good fit: anyone who wants a drawer stock of spares, so a worn coil never leaves the device out of action.
• Good fit: people running a second or backup device who want to keep the cost of parts low.
• Skip if: you cannot confirm which code your device uses. Check first, or ask us.
• Skip if: your device uses a sealed pod or a disposable with no replaceable coil. Those need a whole pod, not a loose head.
• Skip if: you are under 18, or you do not currently use nicotine. Vaping is for adult nicotine users only.

It is worth knowing why refillable hardware matters so much in the UK now. Single-use disposable vapes can no longer be sold, which pushed many adults towards rechargeable kits with replaceable parts. If you are comparing options, our starter vape kits and pod kits show what is available, and the refillable vape pods page lists pods you can fill yourself. Those purchases are ones where a cheap spare coil pack becomes useful.

Finally, a note on the wider accessories range: the coil is one of several small items that keep a device going, along with spare tanks, seals and cables. It is a sensible idea to buy them together rather than one at a time, because a single basket over £20 qualifies for free standard delivery.

Delivery, returns and UK rules when you buy from us

We deliver across the UK. Standard delivery is free on orders over £20 and takes two to three working days, standard delivery under £20 is £2.99, and next-day delivery is £4.99. Order before 4pm on a weekday and your parcel goes out that same day. Every item is 100% genuine, and the full terms sit on the delivery and returns page, so check there for the latest details before you order.

Returns follow a simple policy. For hygiene and safety reasons we cannot take back opened e-liquids, disposables or pods. If something arrives faulty, you can return it within 30 days for a replacement or a refund. A coil head with a visible defect, such as a damaged seal or loose cotton, falls under that faulty-item route, so keep the packaging and contact us promptly. If you are not sure whether an item qualifies, ask first, and we will tell you what to do.

A few UK rules shape what we sell and how. Nicotine e-liquid is capped at 20mg per ml, bottles at 10ml, and tanks and pods at 2ml. Products are sold only to adults aged 18 and over, and age verification applies on the site. Single-use vapes are no longer sold in the UK, so disposable puff counts and battery sizes are not relevant to this listing. When your device or battery reaches end of life, use a household waste recycling centre, battery drop-off point or retailer take-back scheme rather than a household bin.

You can browse the full OBC range, check our brand list for other makers, or read the FAQ page for general help. Questions about fitment or an order are best sent through the contact page, and we will reply as soon as we can.