What is a vape pen? The FDA's term and a pen's parts
A vape pen is a pen-shaped e-cigarette: battery, tank, coil. The FDA's ENDS wording, then two pens read part by part off Innokin's and Aspire's own pages.
By Staff, Pod & Coil
A vape pen is a pen-shaped e-cigarette: a cylindrical rechargeable battery joined to a small tank of e-liquid, which a coil heats into an aerosol that is inhaled. The FDA lists “vape pens” among the many terms for electronic nicotine delivery systems (ENDS), and notes that some of those devices resemble pens.
This is an evergreen explainer, not news. It rests on three pages this desk read on 18 October 2026: the FDA’s ENDS page, Innokin’s Endura T18 product page and Aspire’s PockeX overview. Every specification below is the manufacturer’s own; nothing was tested. The term is also used for cannabis cartridges. This post covers nicotine hardware only.
What is a vape pen, in the FDA’s words?
The FDA page read gives the pen no section of its own. Its ENDS page opens with a list: vapes, vaporizers, vape pens, hookah pens, e-cigarettes, e-cigars and e-pipes “are some of the many tobacco product terms” for the same category. The same page says the e-liquid usually contains nicotine derived from tobacco, plus flavorings, propylene glycol and vegetable glycerin, and that the liquid is heated into an aerosol.
On shape, the page is specific. Some ENDS “resemble pens or USB flash drives”, while larger tank systems or mods bear little or no resemblance to cigarettes. Some have reusable parts; others are disposable and thrown away after use. So a vape pen, in the regulator’s vocabulary, is a form factor inside ENDS. The page read on 18 October 2026 also says e-cigarettes are “not risk-free” and that nicotine is highly addictive.
What is a vape pen made of? Two pens, part by part
| Part | Innokin Endura T18 (spec table) | Aspire PockeX (overview) |
|---|---|---|
| Format | Battery tube, 510-thread tank | Sealed all-in-one (AIO) |
| Battery | 1000mAh, built in | Not in the text read |
| Tank | 2.5ml, stainless steel and Pyrex, top fill | Pyrex tube, top fill under a screw cap |
| Coil | 1.5ohm, replaceable | 0.6ohm 316L steel; 1.2ohm Kanthal option |
| Power | 14W maximum output | Not in the text read |
| Charging | Micro USB, “5V/500mAh” as printed | Type-C port |
| Switch | 3 clicks on/off | 5 clicks on/off |
| Size | 18mm x 136mm | Not in the text read |
The battery is the body of the pen. Innokin calls the T18’s 1000mAh cell built in, so it charges in place rather than coming out. Its charging row reads “5V/500mAh”; mAh is a unit of capacity, not current, so that figure is quoted as Innokin prints it. The T18 charges over Micro USB, and the table is the spec page as it read on 18 October 2026.
The connection is what makes the T18 a classic pen. A thread type on the spec sheet, 510, means the tank screws onto the battery. The PockeX overview read names no thread at all; Aspire describes it as an all-in-one, with the tank built into the body.
The coil sets how the pen behaves. Innokin says the T18 is “optimized at 14 Watts” with its 1.5Ω coils, which also fit its T22. Aspire calls the PockeX “a sub-ohm device” on its 0.6Ω coil, and offers the 1.2 ohm Kanthal head for people who prefer high-nicotine e-liquid.
How does a vape pen work?
Press the button and the battery sends power to the coil. The coil sits in a wick soaked in e-liquid; it heats, the liquid vaporises, and the aerosol is drawn through the mouthpiece.
The wick has to be full first. Aspire tells PockeX owners to let a new coil soak for around 2-3 minutes, depending on liquid thickness, before firing, so the atomizer does not burn out. A coil fired dry is the usual start of the problems in how to fix a burnt vape. Battery state is shown by light: the PockeX glows blue above 30% and red below it, and what other light patterns mean is in why a vape flashes and stops working.
Vape pen vs pod system vs disposable
A pen keeps a tank you refill and a coil head you change on its own. A pod system puts the liquid in a removable pod, often with the coil built into it, so the pod is what you replace. The PockeX sits between the two: sealed like an AIO, but with a replaceable coil. A disposable, in the FDA’s words, is used once and then thrown away. How pod systems compare as a class is covered in refillable pod systems reviewed as a class.
Questions readers ask
How does a vape pen work?
A button sends power from the battery to the coil, the coil heats e-liquid held in its wick, and the aerosol is drawn through the mouthpiece. The FDA’s own description is that the liquid is heated to create an aerosol that is inhaled. Innokin’s T18 switches on with three clicks; Aspire’s PockeX with five.
What is the difference between a vape pen and a pod?
A pen is a cylindrical battery with a refillable tank, either screwed on or built in, and a coil head you replace on its own. A pod system puts the liquid in a removable pod, often with the coil inside it, so the pod is the part you replace. Both are battery-powered ENDS in the FDA’s terms.
Is a vape pen the same as an e-cigarette?
In the FDA’s usage, yes. Its ENDS page lists vape pens, vapes, vaporizers, hookah pens, e-cigarettes, e-cigars and e-pipes as some of the many terms for electronic nicotine delivery systems. The page read gives no separate definition of a vape pen; the name describes a shape, not a regulatory class of its own.
A pen is used with nicotine-containing e-liquid, and nicotine is an addictive chemical. It is hardware for adults of legal purchase age only: 21 and over in the United States; other markets set their own limits.