Vape Battery Safety and Useful Tips


With the increased popularity of high-powered regulated mods, more and more vapers have started subohming and cloud chasing without learning the basics of battery safety. If you want to skip these and go straight to our recommended batteries check out our top battery picks here.

I’ll share some basic facts and tips which will, hopefully, prevent any accidents and let you safely enjoy vaping.

Just because you have bought a regulated mod with all sorts of protection features doesn’t mean you can use cheap and shady batteries and go on vaping happily at 100W or more without risking the mod’s and your own safety!

What you absolutely need to know is how your style of vaping and the resistance range affects the choice of battery you need to buy. This goes for the majority of mods which use one, two or three 18650 batteries which are connected in series (for more power) or in parallel (for more vape time).

The authoritative battery tester known in the vaping community as Battery Mooch has his blog on which is the biggest e-cig forum in the world.

Thinking about which battery is safe for subohm vaping? In Mooch we trust as regards battery safety! You name it, Mooch has tested it and published the results:  

Basic battery safety knowledge you need

The most important values related to battery operations can be easily calculated if you know the Ohm’s Law. You can also use a free calculator and get the picture of how much strain you’re putting on your battery.

The site to go to most calculations and safety checks as regards safe vaping is so feel free to check it out any time you are in doubt whether you’re within safe limits.

Since most of you vapers use regulated mods (with a built-in chipset which controls everything), you don’t have to think about safety in the way that mechanical mods users do.

Mech mods have no chips and no control buttons other than the fire button. They require a little more knowledge and caution.

For regulated mod users, knowing the basic battery features is enough for safe vaping. Two most relevant properties you should know are:

Battery capacity = how long can you vape, expressed in mAh (milliamp hours)

Continuous discharge rating (CDR) = how much continuous current discharging the battery can handle safely, expressed in A (Ampere).

So, if you buy an authentic battery from a reputable seller we recommend getting a 20-30A CDR and 2,500-3,000mAhrs. It’s that simple!

Important note: there are no batteries with 40A CDR on the market. If it says so on the label or in the description, it’s a blunt lie! Do not trust those specs for the sake of your own safety.

Here are a few examples:


Battery Capacity CDR by manufacturer CDR tested by Battery Mooch
Samsung 30Q 3000 15 20
LG HG2 3000 20 18
Sony VTC 5 2600 20A 20A
Samsung 25R 2500 20A 20A
LG HE4 2500 20A 20A


Since battery capacity has more to do with the convenience of how long you can vape before you need to replace the battery, let’s focus on CDR.

How do CDR and the choice of battery affect my safety while vaping?

Let’s say you have a regulated mod which uses external 18650 high-drain battery.

This is what goes on while you’re vaping and your battery has already drained down to 3.2V (needs recharging soon):

Let’s check out three examples when your single 18650 battery charged to 4V.

Example one:

You’re vaping at the resistance of 0.2 ohms at 80W using one 18650 battery, direct-to- lung style:

You’re draining your battery at its maximum 20A CDR limit. You’re heavily depending on the quality of the battery and risking damaging the mod as some of its components may overheat. You will have little vaping time at this wattage. This is NOT safe vaping!

Example two:

Now let’s say that you’re vaping at the resistance of 0.4 ohms at 40W using one 18650 battery, direct-to-lung style:

You’re draining your battery at half its 20A CDR limit. You’re safe and the battery will give you twice the vaping time compared to example one.

Example three:

Finally, if you’re vaping mouth-to-lung style at 1.4 ohms and 11.5W using one 18650 battery:

You’re draining your battery at the rate of one-seventh of its 20A CDR limit. You’re absolutely safe and the battery will give you seven times more vaping time compared to example one.

Again, the voltage in all three examples is 4V from one 18650 battery.

Now, if you have a mod with 2 or 3 18650 batteries connected in series, the voltage will double (two batteries) or triple (three batteries) and this enables extreme vaping at 100W-200W.

If the batteries are connected in parallel, the voltage will remain the same, 4V in this case but the capacity (in mAh) will double or triple and you will have more vaping time.

However, with 2 or 3 batteries regardless of the serial or parallel connection, the maximum continuous discharge rate will remain the same value of a single 18650 batteries, CDR of 20A for example. This important to know for safety reasons!

So, I wouldn’t test the limits of any battery, regardless of the fact how good the battery is. Mods do have multiple protection features including overheating, 10 seconds cutoff, short circuit protection etc. But if the mod protection fails, all sorts of things could go wrong if you’re pushing the safety limits.

If you are using a mod with an integrated battery, you simply need to trust the mod manufacturer that the built-in battery is in full compliance with all battery safety standards.

A few more tips on battery safety

Follow these tips to prevent battery venting, mods melting or exploding!

1. Always buy a quality and trusted batteries from a reputable manufacturer and make sure that the battery has appropriate CDR.

2. Quality batteries are NOT expensive so don’t save on your batteries: you will buy them once a year or even less often if you have several batteries in rotation.

3. To make your batteries safer and long-lasting, use a quality external battery charger.

4. If the battery wrapper gets damaged or torn, rewrap the battery or buy a new one.

5. Keep batteries in safety plastic boxes which prevent batteries from touching each other.

6. Don’t carry a spare battery in your pocket with loose change, keys or any other conductive bits and pieces of metal.

7. If you notice that the battery has started leaking, throw the battery away.

8. If you are using two or three batteries in series or parallel, make sure they are equally charged and of same properties. Use exactly the same make, label them with numbers and always rotate their position in your mod.


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