Vape Battery Guide

Vape Battery Guide – From Beginners to Advanced Vapers

Richard WinterBatteries 16 Comments

When I started vaping in 2014, the most popular choice of device was one of the many EGO Style Pen mods available on the market at the time. These ‘mods’ all came with an internal vape battery which couldn’t be removed and had to be charged within the device. In the relatively early days of vaping, a couple of regulated box mods had also been released (anyone else still rocking the Innokin MVP or Cool Fire 1?!) and these sported an external vape battery. Incidentally, I still own both of those mods and yes, believe it or not they still work!

However, since then the world of vaping has evolved at a mind-blowing pace. There are literally thousands of different mods on the market! Some designed to produce a seriously huge amount of power/watts!

As such, the demand placed on your vape battery of choice is increasing with each new mod released! As a result, it’s never been more important to understand how your vape battery works and, more importantly, how to use it safely.

So, let’s get the basic stuff out the way…

Ok, let’s start from scratch

If we’re going to look at batteries, we need to first at least understand how they function as part of your vape setup. So…

Any setup you use is essentially comprised of the following parts:

 basically the mod itself, either a simple tube mod, EGO Pen, box mod etc. Designed to hold the vape battery and any electronic components to allow for variable power, safety features (such as short circuit protection) etc.

Clearomiser/Tank; your tank of choice houses the coil, wick and e-liquid which screws into the housing via a 510 thread.

Drip Tip; which connects to the tank and allows the lucky user to inhale that sweet (or sour, I won’t judge!) vapour.

Within reason, these various parts are interchangeable; different tanks can be used on different mods and work via the same method. The battery within the mod (whether internal or external) is operated via the firing button. This passes voltage to the 510 connector, which is applied to the coil in your tank.

The coil has a specific resistance and when this voltage is applied to it, current is drawn from the vape battery to heat it. This in turn will vaporise the e-liquid stored in the tank and provide the vapour you’ve been so desperately waiting for!

If you’re new to vaping (or want to help a friend or family member quit the dreaded cancer sticks!) be sure to check out our guide to vaping for beginners!

Anything else I need to know?

Something to keep in mind; one crucial difference when talking about mods and batteries is the difference between a mechanical mod/hybrid mod and a regulated mod. A mechanical mod takes power DIRECTLY from the vape battery, which means it’s important to know that the battery is capable of providing the current required to fire the coil.

This is where it gets tricky…

Without an understanding of vape battery dynamics and Ohms law, you could end up damaging the battery. Or worse, damaging your fingers!

As mentioned, the other option is a regulated mod, in which the vape battery drives a ‘Chip Set’ within the device, regulating the current drawn to the coil. This is generally driven by parameters set on the mod to determine voltage or power drawn. Essentially, protecting the vape battery (and your fingers!) from damage, explosion etc.

Ok, so now that’s out the way, how do I know what vape battery to choose?

Vape Battery; the optionsVape Batteries

Now we’re going to look at the many different types of vape battery available and the terminology used…


With internal batteries, there’s very little to worry about. You just charge, using the supplied charging cable, and vape. It’s recommended to charge until the battery is at full capacity but not essential if you’re in a rush.

A word of warning though; you’re not supposed to leave the mod unattended while charging. Internal batteries use LiPo (Lithium Polymer) which a quick Google search will tell you is NOT particularly safe chemically. In fact, researching this battery type you’d be forgiven for thinking it may try to kill you while you sleep and steal your car…

However, they’re widely used in phones, laptops etc and are perfectly safe provided the device you’re using has adequate protection circuitry.

The obvious disadvantage of using a mod with an internal battery?

Once the vape battery is no longer chargeable or breaks, the mod becomes useless! It’s also worth mentioning, you’re unable to use the mod while charging unless it has a ‘pass-through’ facility.


External batteries are a completely different ball game, commonly broken down into two main categories; Protected and Unprotected.


Batteries have a small circuit board, usually on the bottom of the vape battery, that stops the charging or discharge of the battery in certain circumstances, such as Over-Charge, Over-Discharge and Short-Circuit. These tend to be slightly longer because of the circuitry and are normally classed as ICR.


Batteries have no additional circuitry and should be charged carefully (I’ll explain in more detail further on). They provide nominally 3.7 volts of power, 4.2 volts when fully charged and slowly discharge when used. Once the vape battery is discharged below approx 3 volts, they must be charged again.

Discharging the battery below 3 volts could damage the battery and it’ll no longer be usable. On the flip-side, charging above 4.2 volts could also damage the battery. Therefore, it’s important to invest in a safe charger that’s designed to stop charging at 4.2 volts. Unprotected batteries are normally classed as IMR or INR.

Both Protected and Unprotected batteries come in either ‘Flat Top’ or ‘Button Top’. This means that the positive electrode (end) of the battery is either Flat or Button, with most mods using the ‘Flat Top’ type.

Right, lets delve down a bit…

Most external vape batteries are Lithium Iron (li-ion) and consist of three parts: the cathode (+), the anode (-), and the electrolyte (bit in the middle).

The anode of all 18650 li-ion batteries is basically the same; carbon/silicon and graphite. The cathode, however, is where batteries differ, which is what gives each model its unique characteristics.

One of the trade-offs with cathode chemistry is between energy, capacity, cycle life, and safety. For instance, with ICR (cobalt-based) batteries, the chemistry is both high energy and high capacity, but not especially safe. IMR is safer, but has lower capacity than ICR. Adding nickel to manganese (IMR) gives it a higher specific energy.


The coding used by manufacturers on the battery designates the different chemistry of the battery as follows:

I = Lithium Ion
C/M/F = Cobalt/Manganese/Iron Phosphate Chemistry
R = Rechargeable

IMR – Li-manganese:

Many of the high-drain vape batteries have IMR chemistry. This allows your battery to discharge at a high current while maintaining low temperatures. This means that it’s safer than many of the older ICR batteries. Most IMR batteries don’t require extensive built-in protective circuitry.

INR – Lithium manganese nickel:

The reigning champ of the 18650 vaping world. This chemistry adds nickel to the IMR chemistry above, making it a “hybrid” chemistry. It combines the safety and low resistance of manganese and the high energy of nickel.

The resulting battery chemistry gives you a reasonably high capacity and a high discharge current. More importantly for vapers, the chemistry is far more stable, meaning you don’t need expensive built-in protective circuits.

ICR – Li-cobalt:

The big one! This chemistry delivers the highest energy of any 18650 battery, but at a cost. They are the most dangerous li-ion 18650 batteries available! This is also a problem for high-current discharging, as you cannot safely discharge them at a higher current than their mAh rating.

Because of this dilemma, they are usually fitted with protective circuitry making them a protected cell. This type of battery is not recommended for vaping!


Never mix different chemistry type batteries in a dual or triple mode device. Equally, always keep a matched pair of batteries of the same charge in a dual mod, keeping them charged using a reliable, well known battery charger rather than in the mod itself.

Remember, the slower the charge (typically 750mA), the longer the battery will last. Always buy good brand batteries of a known make, Sony, Samsung, Panasonic, LG etc. NEVER buy any battery with the name “Fire” in it.

We’ve covered the best 18650 batteries for vaping in a separate post, be sure to check it out!

So now I’ve scared you half to death with threats of battery related mayhem, let’s have a look at the different vape battery sizes available…

Vape Battery SizesVape battery sizes

When it comes to battery size, you’re spoilt for choice. There are various different sizes available, however the most popular are the following:

  •             18350
  •             18650
  •             26650

At the time of writing, several of the more recent mods released are using the 20700 and 21700 size vape battery. However, the most extensively used battery to date is the 18650.

These numbers essentially refer to the length and diameter of the vape battery. The first 2 digits are the dimension measuring across, with the remaining 3 digits reference to the length of the battery. Protected circuits will add between 2mm and 3mm to the length of the battery. Therefore an unprotected 18650 battery measures 18mm across its width and 65mm in length.

What about battery Current and Capacity?

Batteries can basically be specified by two characteristics:

Capacity (mAh rating) and Amps (current handling). When choosing a vape battery for your mod, it’s important to pick one which best suits your vaping needs.

Batteries with higher Milliamp Hours (battery life) tend to have a lower discharge rate (lower Amperage, or how much power they can deliver at once). This makes them more suitable for lower wattage devices.

On the flip-side, a vape battery with lower Milliamp Hours will tend to have a higher discharge rating (higher Amperage). And you guessed it, this makes them more suitable for higher wattage devices. There is always a compromise between the two.

Capacity or mAh Rating:

This is a manufacturing standard to identify how long a battery should last from 100% charge right down to fully discharged. A 3000mAh battery can run 3 Amps for 1 hour before full discharge.

Amp Rating/Continuous Discharge Rate (CDR):

The maximum electrical current at which the battery can be discharged continuously before the battery will fail. The “pulse or burst discharge rate” is not a standard measurement and varies from one manufacturer to another. The CDR is the safe operating limit of the cell. NEVER exceed this value otherwise the vape battery could vent or even explode!

So how do I charge my vape battery?

Ok, so we’ve covered the different types of batteries, the different sizes and the basic principle of use. Let’s take a look at another important aspect of using a vape battery; charging.

Internal batteries are charged via a micro USB cable, one end plugged into the mod and the other into either a USB device or a mains outlet.

External batteries require the use of a good quality battery charger. This is the safest way to charge your vape battery, whatever the size or variety. Charging properly with a reliable charger is guaranteed to prolong the life of your battery. If you need any help picking the best battery charger for your cells check out our full guide here.

Several good chargers are available on the market, some single chargers, double chargers (2 batteries) and 4 x chargers. A good charger will charge each battery slot independently of the other and automatically detect the type of vape battery in the slot. It’s also important to choose a charger that delivers a charge at an appropriate rate, safe for the battery. The more advanced chargers available will also show you the static and charging rate in either LED’s or numeric value.

Personally, I would go for the best you can afford at the time as it’ll pay dividends in the future. I use this Nitecore D4, which has all the aforementioned features and is extremely reliable.

It’s also worth mentioning that Xtar and Efest also make good, quality chargers.

A couple of things to remember when charging…
Battery duty cycle:

Approximate number of recharges a vape battery can undergo before it’ll no longer hold a charge. Duty cycles can be as high as 500 charges but will vary depending on the specific battery type.

While a lithium ion battery doesn’t have “battery memory”, the capacity of the battery will decrease over time as you use it, until finally it’ll no longer hold a charge. You don’t have to fully discharge the battery before charging it like you do with many other rechargeable batteries. You can also use it from the outset without first having to charge it.

Just keep in mind, you’ll get longer life expectancy from a battery if you don’t drain them down each time you use them. Charging before the battery is drained will prolong the overall life expectancy. Consistently draining a battery to 3.2 volts or lower before re-charging will decrease battery life expectancy.

Long term storage of batteries:

Lithium batteries should be stored at 40% capacity at room temperature (69 degrees F).

Vape Battery Safety

Battery Safety

Ok, let’s finish things up with a brief overview of how to use your chosen vape battery safely!

Buy a good quality vaping mod:

This is a bit of an obvious one but it really can make a difference. It’s worth spending the cash to get a well made, reliable mod as it greatly reduces the risk of battery venting or explosion.

Do your research before selecting the right battery:

If you’ve purchased a vaping mod that doesn’t come with a built-in battery, you’ll need to choose your own. Most standalone vape mods don’t have batteries included, so buying high quality rechargeable batteries for them from reputable brands is crucial.

Buy a high quality smart charger:

Explosions can occur due to overcharging or discharging of batteries. A smart charger offers more safety features than a regular charger.

Use a battery case for transportation:

It’s crucial to always carry your extra batteries in either a case or a silicone battery sleeve. DON’T leave them loose in your bag or pockets. If batteries come into contact with metal objects such as coins or keys, this can damage the battery or even cause it to explode! This is because the interaction can complete a circuit between the positive and negative.

Use the correct charging cable:

Using a different cable to that which your device came with can damage your battery. This is because the cable may have a higher voltage than your battery which will cause your device to overheat.

Never use damaged batteries:

Using a damaged battery will never end well. If it’s not working properly, if the wrapping is damaged or frayed, or your battery fails to keep charge, expose of the battery safely. There are now custom wraps that you can purchase to re-wrap your battery.

Don’t leave your battery charging unattended:

Not keeping an eye on your vaping mod while it’s charging is a safety risk. Most well-made mods have a cut-off point at which they stop charging when fully charged. BUT unfortunately this function, as with any, isn’t guaranteed to be totally without issue. In order to avoid overcharging your battery, make sure you check it regularly and never charge at night while you’re sleeping.

Don’t exceed the amps of your battery:

Understanding Ohms Law is a vital part of battery safety. Take the discharge rate (the amps), divide it by your voltage level by coil resistance (ohms) and never exceed this rating. For more information, please see our Ohms Law guide or our Ohms Law Calculator.

Don’t charge or rest your device on flammable surfaces:

Never rest your mod on a pillow or flammable surface. It’s also important to prevent exposure to direct sunlight. Therefore, don’t leave it in your car or on your windowsill for long periods of time.

Don’t mix and match sets of batteries or battery chargers: 

While many batteries and chargers may look the same, you should never mix and match. The voltage output may be different which will damage your batteries.

Never over-discharge your battery: 

This can be as harmful as overcharging your device and can cause serious damage to your battery.

So there you have it folks, we hope you found this battery guide helpful. We’ll be posting a stacking/configuration guide and best battery guide soon, so be sure to come back and check those out! Please feel free to share or comment below.

Happy Vaping!

Images courtesy of:

Alpha Stock Images
Andy Armstrong via FLICKR. CC creative commons

Comments 16

  1. Nicely done, I want to say that this article is awesome, great written and include all vital infos. I’d like to see more posts like this.

  2. Hi so I’m using the new smok mag p3, and us the tfv16 tank with a triple mesh or a double that’s rated for 80 watts to 120 but usually have it set lower then 80watts. I found out that the coils last longer and I still get a good hit. So I wanted to see what’s a good 18650? I usually vape it at 60watts to 70 sometimes, and wasn’t sure what Amp an mh battery I should get. And what would you recommend? And at a good price also

    1. Hi Chris, thanks for your question.

      The Mag P3 is a dual battery mod so your current drain will be split between the two batteries. Take a look at our Battery Amp Draw / Drain Calculator and it’ll tell you the drain you’ll put on your batteries for the wattage you’re vaping at. You can use batteries with a CDR value of 20Amps or greater if you wish but the higher CDR value you get the lower the mAh they will be. Our best 18650 batteries guide will tell you the different battery options you can go for.

      Samsung 30Q or Sony VCT6 are both good and reasonably priced, otherwise the Molicel P26A is good but slightly more expensive.

  3. I have a Geekvape Aegis Boost Pro which is capable of 100 watts and powered by a single external 18650. I’m considering a battery from Nitecore, an 18650 IMR rated at 3100mAh with a CDR of 20A. I believe it has a Panasonic core, would this be a good choice for my device? What battery specs would you recommend for my device? Thank you for your time and response..

    1. Hi Lee,

      Thanks for your comment. If you plan on vaping near the 100W max limit I’d really recommend using a 30A CDR battery. The Samsung 20S is a 30A battery but only 2000mAh. Unfortunately it’s a trade-off between CDR and mAh rating.

      You can use our ‘Battery Amp Drain Calculator‘ and input the wattage you’ll be vaping at and the specifics of your battery. The calculator then tells you the current you’ll be drawing from your battery and whether we would recommend doing so. Vaping at a lower wattage or not using the battery right down to its cut-off voltage does mean you can use a lower CDR value battery.

      Other batteries we’d recommend taking a look at are the Sony VTC5A and the Molicel P26A, both rated at 25A. You might find our post on the best 18650 batteries for vaping useful. Hope this helps Lee.

  4. Hi I’ve just bought a charger with 4 18650 9900mAH batteries and I’m using a smok rpm80 e-cig will these be ok or too high mAh (9900) thanks

    1. Hi Jonathon,

      The mAh rating of a battery lets you know the capacity of the battery i.e. the battery life. The higher the mAh rating the longer the battery will last before needing a recharge. Unfortunately there aren’t currently any 18650 batteries on the market that hold a 9900mAh rating. It’s quite common for Chinese manufacturers to make grandiose claims that the batteries they’re selling have incredibly high mAh ratings, but unfortunately this isn’t the case. Currently the maximum mAh rating of an 18650 battery is around 3500mAh (at the top end!).

      The next important point is that the mAh rating on a battery has no bearing over whether or not it’s safe to use in a vape mod. Instead you need to understand the CDR value of the batteries you’re using. The CDR value is essentially the amount of current (in amps) that the battery can deliver at any one time, typically 20A or 25A.

      You mentioned that you’re using a Smok RPM80 but these devices actually use an internal battery. The Smok RPM80 PRO device is the one that uses external batteries. If your mod is actually the Smok RPM80 PRO version then you’d need a 30A battery to deliver the maximum 80W the device is capable of. If you’re looking for a bit more information then check out our ‘Battery Amp Drain‘ calculator. This will tell you the type of battery you need for your device. Hope this information helps Jonathon. Any problems please feel free to get in touch 🙂

        1. Hi Jonathon,

          Great choice on the Smok RPM80 Pro. I actually have one of these devices myself and we’ll be writing a review on it shortly! There are several batteries I’d recommend such as the LG HB2/HB4/HB6 (30A), Samsung 20S (30A), Samsung 25S (25A), Sony VTC5A (25A) or the Molicel P26A (25A).

          The Smok RPM80 Pro will draw just over 25A from the battery at its maximum 80 watts. So if you’re planning on using the mod at 80W then I’d go for one of the 30A batteries listed above. If you’ll be vaping lower that 80W then you can buy one of the 25A batteries listed above. The advantage of the 25A batteries is they have a longer mAh capacity (battery life).

          If you want a bit more information on these batteries check out our best 18650 battery guide. Hope this helps Jonathon. Happy vaping 🙂

    1. Hi Lewis, thanks for the feedback. Unfortunately, there is no straight answer to your question. It depends entirely on location, charging current, the type of battery, type of charger etc. It would potentially be possible to calculate this by working out how many kilowatt’s per hour your full charge takes. Then check your electricity tariff to see how much you pay per kilowatt. But rest assured, you’re talking pennies/cents to charge a battery. Much cheaper than smoking!

  5. Very good information. Excellent article. I have a doubt about batteries for 510 thread cartridges. They usually have three options of voltage, lets say 4.0, 3.6, 3.3v. I have not being able to find information about the temperature these three settings heat the cartridges. May you provide information about this? Thanks.

    1. Hi Sandra, thanks for the feedback. Glad you found the post helpful! You would need to look at the technical data sheet for the temperature coefficient of your specific battery at low voltage cut-off (3.2v), nominal voltage (3.7v) and full charge voltage (4.2v). Hope this helps

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