# Aspire Zelos 3: what it really gets through daily > Aspire Zelos 3: how the coil and the wattage change the millilitres used each day, and why that number matters more than the figure on the bottle. A device is rarely judged by its spec sheet after the first week. What people actually notice is the number of bottles they have opened. The **Aspire Zelos 3** illustrates that gap better than most kits sold in Britain: two people running the identical kit can be three to one apart on liquid used, with nothing different between them except the coil screwed into the tank. Here is how to read this device by volume rather than by the wattage on the screen. ## Aspire Zelos 3: which generation are we talking about The Zelos range spans several generations and several variants, which muddles a lot of the comparisons you find online. It is worth pinning down the exact model before anything else. This article covers the Zelos 3 mod, released in 2021, sold in Britain most often as a kit with the Nautilus 3 tank. It is a different device from the later Zelos M80 and Zelos X80, whose specifications do not carry over. The points confirmed across several UK retailers and on the manufacturer listing are these: a 3200 mAh built in battery charged over USB-C, variable output from 1 to 80 watts, an accepted coil range of 0.1 to 3 ohms, and a chassis measuring 81.5 by 37.7 by 28.2 mm. The kit ships with two coils of very different values: a Nautilus BVC at 1.8 ohm, with a stated working window of 10 to 14 watts, and a Nautilus 2S Mesh at 0.7 ohm, stated at 20 to 25 watts. The tank also accepts the other coils in the Nautilus family. One word on capacity, because it is the single most common source of confusion. The Nautilus 3 circulates with a 4 ml capacity on markets outside the United Kingdom and the European Union. The compliant version sold here is capped at 2 ml, and that is the figure to use in any consumption sum done in Britain. ## What the coil value changes about the volume used Two coils in the same box, two consumption regimes with nothing in common. This is the point product listings pass over in silence, even though it drives the entire liquid budget. A coil heats saturated cotton and turns liquid into vapour. The higher the applied power, the more liquid is vaporised per second of draw. The value in ohms does not act directly: it sets the power band inside which the coil works properly. In practice, the 1.8 ohm BVC sits around 10 to 14 watts. The 0.7 ohm 2S Mesh sits around 20 to 25 watts, roughly double. At an identical draw length, the volume of liquid used follows that gap very closely. That is where the real difference lives. The same **Aspire Zelos 3**, with the same bottle and the same person holding it, does not empty its tank at the same rate depending on which coil is fitted. Switching from one to the other is noticeable within a single day. ## Aspire Zelos 3: turning watts into millilitres per day The 2 ml tank then becomes a very convenient unit of measurement. Counting refills is more reliable than counting puffs, and it needs no extra equipment at all. | Setup on the Zelos 3 | Stated power | 2 ml refills per day | Approximate daily volume | |---|---|---|---| | Nautilus BVC 1.8 ohm, tight draw | 10 to 14 W | 0.5 to 1 | 1 to 2 ml | | Nautilus BVC 1.6 ohm | 7 to 11 W | 0.5 to 1 | 1 to 2 ml | | Nautilus 2S Mesh 0.7 ohm, airier draw | 20 to 25 W | 1.5 to 2.5 | 3 to 5 ml | These ranges are observed orders of magnitude rather than guaranteed values, and they assume steady use spread across the day. Their job is to make the relationship between the two supplied setups visible. The lesson fits in a sentence: on this kit, changing coil commonly moves consumption by a factor of two or three. A 10 ml bottle that used to see out the week can be gone in two or three days, which is exactly what our piece on [how long a 10 ml bottle really lasts](/uk/how-long-does-10ml-e-liquid-last/) breaks down by configuration. ## The 2 ml cap sets its own rhythm The British 2 ml tank limit has a practical consequence that is easy to underrate. It turns refill frequency into a direct reading of consumption, with no arithmetic required. One refill every two days signals a modest regime. Two refills a day signals a regime three to four times higher, with everything that implies for bottles bought and coils worn out. That capacity also explains why the low resistance setup becomes demanding in daily use. A 2 ml tank emptied in half a day means carrying the bottle everywhere, which is simply not the case on the tighter setup. ## Nicotine strength is read alongside volume, never on its own This is where the mechanics of the device meet the label on the bottle. The nicotine that passes through in a day does not depend on the printed strength, but on that strength multiplied by the number of millilitres used. The same bottle run on the two supplied coils therefore does not represent the same daily figure at all. Doubling or tripling the volume at a constant strength multiplies the total in the same proportion, and no screen anywhere displays it. The reasoning also runs the other way, which is what catches people out. Plenty of people who move down a strength step find their volume in millilitres climbs, which cancels part of the change they were after. That mechanism is walked through in our article on [stepping nicotine strength down](/uk/lower-nicotine-strength/). There is no universal figure worth naming here, neither for strength nor for the setup: it depends on the hardware, the rhythm and the individual. What is useful is holding the two numbers together, the mg/ml and the ml per day, rather than reading the label alone. To place the units against one another, our piece on [nicotine in a cigarette](/uk/nicotine-in-a-cigarette/) works as a reference point. ## What battery life tells you about consumption The 3200 mAh cell in this mod is built in, not removable, and charges through the USB-C port. That simplifies the safety question: there is no cell to remove, carry or charge separately. On the variants in the range that run a removable 18650 cell, the usual precautions still apply: an intact wrap with no nicks, transport in a hard case rather than loose in a pocket, and a charger suited to the format. Runtime works as a decent indirect indicator. A 3200 mAh battery lasting two full days points to a low power regime, so a moderate liquid volume. The same battery flat before the evening points to the opposite. In practice, on an **Aspire Zelos 3**, runtime and liquid consumption always move in the same direction. If charges become more frequent with no change of habit, the millilitres have gone up too, and the bottle will follow. ## Three days is enough to know your real figure No published average beats a personal reading, and the exercise needs only three consecutive days. The method comes down to three actions. 1. Note the coil fitted and the wattage set, since those are the two variables that command everything else. 2. Mark a stroke on the bottle label every time you refill the tank. 3. Multiply the strokes by 2 ml for the daily volume, then by the bottle strength for the figure in milligrams. Two precautions sharpen the reading considerably. The first day on a fresh coil uses a little more, because priming the cotton absorbs a small amount of liquid that will never become vapour. A new flavour also stretches sessions out for two or three days. Once that number is known it becomes the only stable reference point in the routine. It survives a change of flavour, it takes thirty seconds to recalculate after a coil change, and it finally makes situations comparable that looked contradictory before. ## Frequently asked questions ### What tank capacity is sold in the United Kingdom? The compliant format is capped at 2 ml. The 4 ml capacity you see quoted online belongs to versions built for other markets and is not what you will receive here. ### Do the two supplied coils use the same amount? No, and the gap is large. The 0.7 ohm runs at roughly double the wattage of the 1.8 ohm, and the volume of liquid used follows that difference. ### Is the battery replaceable? No. It is built into the mod and charges over USB-C. The variants in the range that take an 18650 cell are a different proposition entirely. ### Why does my bottle last less since I changed coil? A fresh coil vaporises more than a gunked one at identical settings. If the value in ohms also changed, the two effects stack on top of each other. ### How long does a charge last? Entirely down to the wattage used. At low power a charge often covers more than a day, while the 20 to 25 watt setup drains it noticeably faster. ## What to look at before setting the device up An **Aspire Zelos 3** is not summed up by the 80 watts printed on the box, because nobody vapes permanently at the top of the band. What counts day to day sits in two numbers: the coil value fitted, and the number of 2 ml refills done between waking and sleeping. Everything else follows from those two: the liquid used, how often you charge, and the daily nicotine figure. Three days of counting turn a vague impression into a usable number, and it is that number which makes one setup comparable to another. It is also what explains why two people with an identical **Aspire Zelos 3** describe such different consumption. They are simply not talking about the same device set up the same way. Editorial content for adult readers only. Nicotine is a substance that causes addiction. Not for sale to under-18s in the United Kingdom. This article is not a buying recommendation and is not personalised advice.