21700 Vape Batteries

21700 vape batteries are a larger type of vape battery for use in a range of different vape devices, including vape mods and kits that use a replaceable battery. The ‘21700’ in the battery name refers to the dimensions and shape of the battery. The ‘2170’ tells us that the battery is 21x70mm in size while the ‘0’ at the end indicates that it is a cylinder. 

21700 batteries will not fit in 18650 kits as they are too big. The larger size of 21700 batteries provides the power for higher wattage kits, making them fantastic for DTL and sub-ohm vaping. Like other batteries, 21700 vape batteries are made from lithium-ion which gives them an excellent safety profile, providing they are charged correctly. If you need any more info on vape battery safety, check out our handy guides here, or chat with one of our vape experts.

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How do Vape Batteries Work?

Before we jump into explaining the mechanics behind your device, there are a few basic scientific principles involved with vape batteries that you should know first. These include:

  • Voltage (volts, V): Voltage is a measure of how much energy is passing electricity through your vaping device’s coil.
  • Current (amps, A): The faster the electrical current flows, the hotter your vape coil will become. 
  • Resistance (ohms, Ω): Ohms are a measure of resistance. The lower the unit of ohms, the greater the production of vapour clouds will be. 
  • Power (Watts, P,W): Power refers to how much energy is being used or produced in a vape battery. 
  • mAH Capacity Rating: Measured by milliampere-hour, the mAH Capacity Rating of a vape battery translates to how much energy can be delivered within the time frame of one hour. 

When a vaping device’s firing button is activated, both internal and external vape batteries function by passing voltage to the coil in your tank, where an electrical current is then drawn from the vape battery to heat it and produce delicious vapour! The flow of the current, i.e how quickly your device can heat up vapour, will vary depending on your coil’s resistance (ohms, Ω).

What are Vape Batteries Made Of?

Both internal and external batteries are made from Lithium-ion, which is commonly used in a number of other portable conventional electronics, such as electric vehicles or radio controlled toys.

Which Vape Battery Does My Device Need?

For sub ohm / direct to lung (DTL) devices, we recommend using a battery with a high Amp output. Those vaping with a mouth to lung (MTL) device should stay with a lower Amp output battery - this is because MTL devices have a higher coil resistance which requires less power than DTL device’s low resistance coils.

Are vape Batteries Safe?

Most battery chargers and vaping devices will have short circuit and over charge protection, however it is important to be aware of several general battery safety precautions before hitting your vape.