September 8, 2026

How Do Pod Vape Kits Work?

Pod vape kits work through a simple sequence: battery sends power to a coil, the coil heats e-liquid held in a wick. The vapourised liquid is then drawn through the mouthpiece. This guide explains each part of that process in plain English.

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Quick answer: When you inhale on a pod kit (or press the fire button on button-activated models), the battery detects the action and sends power to a small coil inside the pod. The coil heats rapidly to between 150 and 250 degrees Celsius, vapourising the e-liquid that has soaked into the cotton wick surrounding it. The resulting vapour travels up through the pod and mouthpiece into your mouth. The process takes less than a second and repeats each time you draw.

The Four Components That Work Together

Every pod kit relies on the same four elements regardless of brand or price. Understanding what each one does makes the whole system easy to follow.

Battery

The rechargeable lithium battery stores energy and releases it on demand when the device fires. In draw-activated pod kits a small pressure sensor detects airflow when you inhale and triggers the battery automatically. In button-activated kits you press a physical button to fire. Battery capacity ranges from around 400mAh in compact devices to 1500mAh or more in larger pod mods. Capacity determines how many puffs you get between charges.

Coil

The coil is a length of resistance wire wound into a spiral or formed into a mesh sheet inside the pod. When current passes through it, electrical resistance converts that energy into heat. Modern pod coils are most commonly made from kanthal wire wound around cotton wicking or from stainless steel mesh. Coil resistance in MTL pod kits typically ranges from 0.6 ohm to 1.2 ohm. Higher resistance means lower heat and a tighter draw.

Wick

Cotton wicking material wraps around the coil and draws e-liquid from the pod reservoir by capillary action. The wick keeps the coil surface saturated with liquid so there is always fresh e-liquid available to vapourise with each puff. When a wick runs dry and the coil fires without liquid present, the cotton scorches and produces a harsh burnt taste. This is a dry hit and is the most common cause of premature coil burnout in pod kits.

Pod Reservoir

The pod body acts as the e-liquid reservoir, holding up to 2ml of liquid under UK TRPR regulations. In refillable pods a silicone-sealed fill port on the side or base allows you to top up with bottled e-liquid. In prefilled pods the reservoir is factory-sealed and the entire pod is replaced when empty. The reservoir feeds liquid continuously to the wick through small inlet holes at the base of the coil assembly.

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Draw Activation vs Button Activation

The way a pod kit detects that you want to vape is one of the most noticeable differences between models. Both methods produce the same result but feel slightly different in use.

Activation Type	How It Works	Advantages	Disadvantages
Draw activation	A pressure or airflow sensor inside the battery detects the drop in air pressure when you inhale and fires the coil automatically	No buttons to press. Feels most like smoking. Simple and intuitive for new vapers	Can occasionally misfire if the device is squeezed. Slightly less responsive than button activation
Button activation	You press and hold a physical button while you inhale. The battery only fires while the button is held	More precise control over when the device fires. Less risk of accidental activation in a pocket	Requires a button press with every puff. Slightly more effort than draw activation
Dual (both)	Some pod kits include a toggle or mode switch that allows you to choose between draw and button activation	Flexibility to suit different preferences or situations. Can switch between modes	Slightly more complex to set up for first-time users

What Happens Step by Step When You Take a Puff

Sensor Detects Your Inhale

On a draw-activated pod kit, the moment you begin to inhale the airflow sensor detects the pressure change and sends a signal to the battery circuit. On a button-activated device the circuit closes the moment you press the fire button. Either way the battery begins releasing power to the coil within milliseconds of your action.

Current Heats the Coil

Electrical current flows through the resistance wire or mesh of the coil. The resistance converts this electrical energy into heat, raising the coil temperature to between 150 and 250 degrees Celsius depending on the coil resistance and the wattage the battery delivers. In fixed-output pod kits the wattage is preset by the manufacturer to match the recommended coil. In adjustable pod mods you set the wattage manually.

E-Liquid Vapourises from the Wick

The heated coil surface vapourises the e-liquid that has soaked into the surrounding cotton wick. The liquid transitions from its liquid state into a fine aerosol. PG in the e-liquid carries the flavour compounds into the aerosol and also contributes to the throat hit sensation. VG produces the visible vapour density and gives the inhale its smooth character.

Vapour Travels to the Mouthpiece

The aerosol produced at the coil travels upward through the pod's airflow channel to the mouthpiece. The tightness of the draw is controlled by the airflow channel diameter. Narrow airflow channels produce the tight, cigarette-like mouth-to-lung draw that most pod kits are designed for. Wider airflow channels produce a looser, more airy draw closer to a restricted direct-to-lung style.

Wick Reabsorbs Liquid from the Reservoir

After each puff the wick immediately begins drawing fresh e-liquid from the pod reservoir by capillary action, resaturating the cotton ready for the next puff. This happens automatically and continuously as long as there is liquid in the pod. If the pod runs low on liquid the wick may not resaturate fully before the next puff, which produces a dry hit. Keeping the pod topped up above the minimum fill line prevents this.

For guidance on which e-liquid works best in a pod kit and why the PG:VG ratio matters, read our guide to What E-Liquid Should You Use in a Pod Kit? To explore how pod kits differ from vape pens and box mods, the full Pod Vape Kit Guide covers both comparisons in detail.

Frequently Asked Questions

What is the difference between a coil with a built-in wick and one with replaceable coil heads? In most beginner and mid-range pod kits the coil and wick are combined into a single integrated unit built into the pod itself. When the coil burns out you replace the whole pod. In higher-end pod systems the pod is a permanent reservoir and only the coil head screws in and out. Replacing just the coil head is cheaper than replacing the whole pod but requires more hands-on interaction with the device. The end result in terms of vapour and flavour quality is equivalent.

Why does my pod kit produce less vapour than a sub-ohm device? Pod kits operate at lower wattages than sub-ohm devices, typically 10W to 25W versus 40W to 100W for sub-ohm kits. Lower wattage means less heat and less liquid vapourised per puff. The 50:50 e-liquid used in pod kits also produces less dense vapour than the high-VG shortfills used in sub-ohm devices. For an MTL pod kit this is by design: discreet vapour production is one of the format's main advantages for vapers who want a cigarette-like experience without large visible clouds.

What causes a burnt taste in a pod kit? A burnt taste means the coil has fired without enough liquid saturating the wick. The most common causes are: a pod that is nearly empty and no longer feeding liquid to the wick efficiently; vaping too rapidly without giving the wick time to resaturate between puffs; using a new coil without allowing time to prime; or using high-VG e-liquid that is too thick to wick quickly through the small coil ports in an MTL pod kit. Once the cotton has scorched the coil needs to be replaced as the burnt taste persists even after refilling.

Does higher coil resistance mean a tighter draw? Coil resistance and draw tightness are related but distinct. Draw tightness is primarily determined by the airflow channel design rather than the coil resistance directly. However higher-resistance coils are typically paired with tighter airflow channels in MTL devices because the lower heat output of a high-resistance coil at low wattage suits the slower, more controlled inhale of MTL vaping. Lower-resistance sub-ohm coils are paired with wider airflow channels that allow the faster, deeper direct-to-lung draw.