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Vape battery safety guide

A Beginner Guide to Battery Safety: 18650 and 21700 Vape Batteries

Written by: Evolution Vaping

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Time to read 5 min

Vape Batteries come in a range of sizes and are lithium ion or LI-ON. These can be removed and charged in a suitable charger or can be charged inside the device via the USB port. Its important to bear in mind the safety steps outlined in this guide as well as manufacturer guidelines. A vape battery can come in a range of sizes such as 18350, 18650 ,20700 and 21700. The first 2 digits are diameter in mm, the second pair of digits are the height in mm and the ‘0’ refers to the shape of the battery (its round). Battery safety is paramount when it comes to vaping. In this guide, we'll cover essential tips to ensure the safe usage of 18650 and 21700 vape batteries. Let's dive in!

Choosing a suitable vape battery

A battery suitable for vaping will always be accompanied by a list of specifications. Making it easy to identify the capacity, amp rating and size. Some notable and trusted brands are Hohm tech, Vapcell, and Molicell. These companies specifically make batteries for vaping use and are often reviewed online with regards to the accuracy of their stated ratings. 


The specs should include at least the following:


  • Continuous discharge rate
  • Battery life in mAh
  • Battery size - 18650, 21700 etc
  • Nominal voltage
  • Discharge end voltage

Its also important to regularly check your batteries over for any damage. This can include dents and scratches to the body of the battery itself. It will also include any tears in the battery wrap.

Battery Wraps

  • Regularly inspect the battery wraps for any tears or damage.
  • Damaged wraps can expose the metal casing, leading to potential short circuits or battery failure.
  • If you notice any tears, promptly re wrap the battery or replace it

Battery Dents

  • Check the battery for any dents or deformities.
  • Dents can compromise the structural integrity of the battery, increasing the risk of venting or explosion.
  • If you find any dents, it's crucial to replace the battery immediately with a new one.

Vape Batteries for Different Devices

When looking for a suitable vape battery its also important to keep in mind what type of device you will be using the battery in. It could be a mechanical or unregulated device which does not feature any safety precautions. Or it may be a regulated device with a screen and chipset that has safety precautions built in. There are benefits to both types of device and using the correct battery will ensure a safe and enjoyable vaping experience.

Mechanical/Unregulated vape mods

Mechanical and unregulated devices have no safety features included. You must always make sure your batteries are suitable and that both the device and batteries are well maintained.

When using a mechanical/unregulated device, ensure the battery's amp rating (continuous discharge rating) can handle the device's power demands. See ohms law. Exceeding the battery's amp limit can lead to overheating, venting, or other safety hazards. Consult the manufacturer's guidelines or seek expert advice to determine the suitability of your battery for your specific device.


If in doubt contact one of our helpful customer service reps who will ask about your vape kit and recommend a suitable battery. With mechanical and unregulated vape mods in particular checking for dents and tears in the wrap is even more important! There are no safety features on these devices.

Regulated vape mods

Warhammer Box mod

A regulated vape mod or box mod will have a chipset built in which allows you to have more control over the way you vape. The chipset also acts as an intermediary between the batteries and the tank or RDA. It will in most cases include safety features such as overheat protection and over use protections.

Regulated devices have built-in safety features that protect against excessive current draw or short circuits. However, it's still important to choose a battery with an appropriate amp rating. Refer to the device manual or manufacturer's recommendations to select the right battery for your regulated device.



For more information on amp ratings and what vape battery is suitable for your device check out our page on ohms law and how this applies to your vape set up.

Using a suitable vape battery charger



Invest in a high-quality vape battery charger that's compatible with your specific battery type (18650 or 21700). Using the correct charger ensures proper charging voltage and current, reducing the risk of overcharging or damaging the battery. Avoid using generic chargers or chargers not designed for a vape battery.


A good vape battery charger will have a few key features:


  • Safety Features: Look for features like overcharge protection, short circuit protection, reverse polarity protection, and over-current protection. These safeguards prevent potential hazards, ensuring a secure charging process for your vape batteries.

  • Adjustable Charging Speed:The ability to adjust the charging speed is a valuable feature. Some batteries may benefit from slower charging to extend their lifespan, while others may need a quicker charge for immediate use. 

Charging Precautions


Ensuring safety when using a vape battery charger is crucial to prevent accidents and extend the lifespan of your batteries. Here are some precautions to take:


  • Confirm that the charger is compatible with the type and size of batteries you are using. Some chargers are designed for specific battery chemistries, voltages, or sizes, so using the correct charger is essential.
  • Charge your batteries in a well-ventilated and fire-safe area. Avoid charging batteries on flammable surfaces or near combustible materials. Do not leave charging batteries unattended.
  • Always adhere to the manufacturer's guidelines and instructions for both the charger and the batteries. This includes information on the appropriate charging current, voltage, and any specific recommendations.
  • Keep an eye on the charging process. Remove batteries from the charger once they are fully charged to prevent overcharging. Continuous overcharging can reduce battery life and pose safety risks.
  • Overcharging can lead to overheating and battery failure. Choose a charger that has overcharge protection, and do not leave batteries on the charger longer than necessary.
  • Place the charger on a non-flammable surface to minimize fire risks. Charging on materials like wood, metal, or ceramic is preferable.

Conclusion

By following these battery safety guidelines, including checking battery wraps and dents, understanding battery ratings, and using suitable chargers, you can ensure a safer vaping experience. Prioritizing battery safety is crucial for the longevity of your vape device and, most importantly, your personal well-being. Happy and safe vaping!

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