So you've got a shiny new device but unsure which batteries will serve you best. Hopefully by the time you've read the below you will have more confidence on batteries and all that they involve. 

What is a battery?
Rechargeable, lithium-ion batteries are found in almost every device that can be recharged; from mobile phones, tablets, laptops and now in 2023 even cars!



The 2 most common types of vape batteries on the market are 18650 and 21700. And are sometimes referred to as 'cells'.
The numbers in their name tell us more than you'd think, and aren't just random. The 1st 2 digits gives us information about the batteries diameter (18mm or 21mm) the 2nd 2 numbers give us the length (65mm or 70mm) and the last number is the batteries shape (0 meaning round) 



If you're not too fussed about battery capacity, and how long the battery will last then this should be enough information to help you out. When purchasing a new device, if you read the items description online it will advise which battery type is needed - some can take both, but due to the size differences may need a sleeve added or removed to make the selected battery work (which will be included with the device)

The performance capabilities of a battery can be the difference between your vape dying before you get home, or lasting more than a day.
We first need to look at the batteries capacity which is shown in mAh (milliamp hours) most commonly ranging from 2500mAh to 5000mAh. The mAh is showing us how much charge/energy the battery will hold.
The crucial part of a batteries performance however is the CDR (continuous discharge rate) which is shown to us in Amps, often represented by an A. Simply put, the higher this number, the more current can be taken from the cell without it becoming too hot.

To choose the right battery you need to look at the wattage you intend to run at. The higher the wattage, the higher the amps you'll need to keep that power there. So don't always go for the highest mAh! Capacity doesn't mean much if the amps are too low. Finding a happy medium of the 2, is the key to a great battery.
If you're running a device at 15w for example, a 10a battery would suffice. However, running it at 150w+ you'd be wanting to look at 20a. 

Safety
The most important part of external/removeable batteries is understanding they can be dangerous. If they are mistreated they can potentially cause damage to you or others. If they are counterfeits, they can also be dangerous so ensure you always buy from a reputable reseller. 

If your batteries have any of the following signs please follow the appropriate actions advised;

  • Wrap is peeling/chipped - do not use until re-wrapped, or discard
  • No wrap at all - do not use until re-wrapped, or discard
  • Rusting - Discard
  • Corrosion - Discard
  • Dents showing top, bottom or anywhere - Discard

*when discarding batteries, please utilise the correct recycling options available in your area or pop them into your local vape store.
**Most vape stores will offer a battery re-wrapping service.

Simple rules to follow to ensure the best battery safety

  • Do not expose batteries to extreme heat or cold
  • Keep liquids away from batteries
  • Do not charge unattended or overnight
  • If your device takes 2 or more batteries, keep them in sets and ensure the mAh and CDR are the same. This way, stronger batteries wont take the strain from weaker batteries. 
  • Never carry your batteries loose in pockets or bags - if they connect with loose metals they will become volatile. Use a battery case always.
  • Use a dedicated battery charger, specifically designed for charging lithium ion batteries. 

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