What do vape box numbers like puffs, mg, and mAh actually mean?

The numbers on a vape box are a mix of marketing claims, product specs and legal limits, and they do not all mean the same thing. Puffs describe how long a device might last, mg describes nicotine strength, and mAh describes the battery. Once you know which is which, a box becomes much easier to read.

To keep things practical, this guide uses the Hayati Pro Max+ 4000 as a worked example. Its listing shows up to 4,000+ puffs, an 850mAh battery, a 1.5ml pod and 20mg/ml nicotine, so it covers almost every figure you will see on a UK vape. Each section below explains what to check before you buy.

What does the puff count on a vape box really tell you?

The puff count is usually the biggest figure on the box, but it is an estimate, not a promise.

•  It often comes from the maker's own testing, using a steady, even draw, which is not how most people vape in real life

•  Short sharp draws, long draws and heavy use all change the result

•  A device listed at up to 4,000+ puffs will not always reach that figure

•  Strong inhales and chain vaping can shorten it, while light, occasional use may stretch it

Treat it as a guide for comparing one device with another. If you are choosing between prefilled pods and other formats, puffs help you judge how often you might replace a pod. They say nothing about flavour, strength or whether the product is legal to sell.

What do mg and mg/ml mean for nicotine strength?

The mg figure shows how much nicotine sits in each millilitre of liquid. A label reading 20mg/ml means 20 milligrams of nicotine per millilitre, and the same strength is often written as 2%.

•  UK limit: 20mg/ml is the legal maximum for nicotine containing vapes and refill liquids, according to the MHRA's advice for retailers

•  Higher figures: if a box shows more than 20mg/ml, stop and check the product

•  Your choice: lower strengths exist too, and the right level depends on how much you smoked or vaped before

Nicotine strength also changes how a device feels. Nic salt formulas, like the one listed for the Hayati Pro Max+ 4000, are generally described as smoother at higher strengths than traditional liquid. If you also buy bottled e-liquids, the same mg/ml limit applies to them.

What does mAh mean on a vape battery?

mAh stands for milliamp hours. It shows how much charge the battery can hold, a bit like the capacity of a water bottle. A bigger number generally means more stored energy, so the device can run for longer between charges.

The Hayati Pro Max+ 4000 lists an 850mAh battery with USB Type C charging and a screen that shows the battery percentage. That screen is handy because you can see when to plug in before the device cuts out.

Capacity is only part of the story, though. Power use, coil resistance and how often you vape all affect real battery life, so two devices with the same mAh can behave differently. If you want a device you can recharge and keep using, browse the range of rechargeable vapes and compare battery sizes alongside pod sizes.

What do the ml numbers on a pod and refill container mean?

The ml figure is the volume of liquid a pod or bottle holds. A 1.5ml pod holds one and a half millilitres, which is about a third of a teaspoon. UK rules cap these sizes for nicotine containing products:

•  Pod limit: the MHRA guidance says vape tanks must hold no more than 2ml

•  Bottle limit: one refill container of nicotine liquid must not exceed 10ml

•  This listing: a 1.5ml pod sits inside the pod limit, and a 5.5ml refill container sits inside the bottle limit

Be careful when a listing mixes the two figures. The Hayati Pro Max+ 4000 page describes a 1.5ml pod combined with a 5.5ml refill container, but it does not explain how the two work together. Check that detail with your supplier before assuming anything about total liquid volume.

What does the ohm number on a coil mean?

The Ω symbol stands for ohms, a measure of electrical resistance. In simple terms, a lower number lets more power pass through the coil, which usually means warmer, bigger clouds. A higher number tends to give a tighter, cooler draw.

The Hayati Pro Max+ 4000 lists a 1.0 Ω mesh coil with draw activation, so it fires when you inhale and needs no button. That suits a mouth to lung style, where you draw into your mouth first and inhale second. Coils wear out over time, which is why UK rules for reusable vapes expect the coil to be removable and replaceable.

How do these numbers look on the Hayati Pro Max+ 4000 box?

Here is the listing from Vape Spot Wholesale, a trusted UK wholesale supplier, translated into plain English:

•  Puffs: up to 4,000+, a maker's estimate that depends on how you vape

•  Battery: 850mAh, rechargeable by USB Type C, with a battery percentage screen

•  Pod: 1.5ml, plus a 5.5ml refill container

•  Nicotine: 20mg/ml (2%) nic salt

•  Coil: 1.0 Ω mesh, draw activated

•  Flavours: 30 blends, including Banana Ice, Blue Razz Lemonade, Triple Mango and Watermelon Ice, plus a mixed box

•  Price: £31.60 for a box of 5 kits, or £6.32 per kit, with shipping and VAT calculated at checkout

The page does not mention MHRA notification, so check that separately before you buy.

Which UK rules sit behind these numbers?

Several figures on a box link straight to UK law:

•  Limits: nicotine strength is capped at 20mg/ml, pods at 2ml and refill bottles at 10ml

•  Notification: nicotine containing vapes must be notified to the MHRA, and a product may not legally be supplied until its notification has been published on the MHRA list

•  Labelling: the MHRA adds that publication does not guarantee the labelling is compliant

•  Single use ban: in force since 1 June 2025, it means a reusable vape needs a rechargeable battery, a refillable container (inserting new prefilled pods counts) and a removable, replaceable coil if it has one

•  Refills: pods or bottles should also be available to buy separately

So a rechargeable battery alone proves nothing. For any product, including this one, check the MHRA notified products list and confirm that replacement pods are sold separately.

What are the health effects behind the numbers?

Nicotine is addictive, and a higher mg/ml figure can mean stronger effects. Vaping can involve health risks, and some people may notice dry mouth, throat irritation, coughing or dizziness, particularly at a strength that is too high for them. Effects vary from person to person, and not everyone will notice them.

Vaping is not recommended for people who do not smoke, and nobody under 18 can legally buy nicotine vapes in the UK. If you are pregnant, breastfeeding or have a heart or breathing condition, speak to a doctor or pharmacist first. Anyone who wants help to stop smoking can ask the NHS or a local stop smoking service about approved options.

How can you read any vape box before you buy?

Run through this quick check each time:

•  Nicotine: confirm the strength is 20mg/ml or lower

•  Pod size: look for 2ml or less on the pod itself

•  Puffs: treat the figure as an estimate and compare like for like

•  Battery: check the mAh and that it recharges by USB

•  Refills: make sure replacement pods or liquid are sold separately

•  Notification: ask the supplier to confirm the product is on the MHRA list

Buying sensibly once you can read the box

Now that you can read the puffs, mg, mAh and ml on a box, the next step is choosing how to buy. Whether you are restocking for yourself or filling shop shelves, comparing your buying options can save time and money.

What is the difference between wholesale and retail?

Retail is when you buy one or two items from a shop at the normal shelf price. Wholesale is when you buy in bigger packs, usually boxes, straight from a supplier, so each item costs less. Shops buy this way so they can sell on to customers, and many everyday buyers use it too.

•  Retail: single items, normal shelf price, bought from a shop

•  Wholesale: boxes or bulk packs, lower price per item, bought from a supplier

Why can buying wholesale work out better?

Buying wholesale can save you money and effort, as long as you'll really use what you buy. Here's why it often works out better:

•  Lower price per device: boxes usually cost less per item than buying one at a time

•  Fewer orders: one box can cover weeks or months of use

•  Steady supply for shops: shelves stay stocked without repeat trips

•  Wider choice: more flavours and brands in one place

•  Easy to start small: with no minimum order, you don't have to buy a huge amount

Retail still makes sense if you only want to try one flavour. Wholesale tends to win once you know what you like, or when you're stocking a shop.

Why buy from Vape Spot Wholesale

If you'd like genuine stock from a UK supplier that keeps things simple, Vape Spot Wholesale is a trusted wholesale supplier for both shops and everyday buyers. Orders placed before 3pm on a working day are dispatched by 3pm the next working day. You also get TPD compliant products, free delivery over £250 and a 30 day returns policy. You can read what customers say about the shop on Trustpilot.

Frequently asked questions about vape box figures

What does 4,000 puffs mean on a vape?

It is the maker's estimate of how many draws the pod might give under test conditions. Real use varies, so treat it as a rough guide rather than a guarantee.

Is 20mg/ml a strong nicotine level?

It is the highest strength allowed in UK regulated products. Whether it suits you depends on your past smoking or vaping habits, so ask a pharmacist or stop smoking adviser if you are unsure.

How long does an 850mAh vape battery last?

There is no fixed answer. Battery life depends on power use, coil resistance and how often you vape, so the mAh figure is only a starting point.

What does 1.5ml mean on a pod?

It is the volume of liquid the pod holds. UK rules limit nicotine containing vape tanks and pods to 2ml, so 1.5ml sits within that cap.

Does a rechargeable battery make a vape legal?

No. The single use vape ban also looks at refillable containers, replaceable coils and whether refills are sold separately, and nicotine products need a published MHRA notification.

How can I check whether a vape is on the MHRA list?

Search the MHRA notified products list online, or ask your supplier to confirm the notification details. Products without a published notification should not be supplied.

⚠️ This product contains nicotine, a highly addictive substance, and is intended for adults of legal vaping age (18+) in the UK. It is not suitable for those who do not smoke, pregnant or breastfeeding individuals, or those with heart or respiratory conditions. Keep out of reach of children and pets at all times.