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Efest 21700 3700 mAh 35A Battery

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Efest is known to be a reliable source of power for your vape mods. This larger battery was designed for mods that utilizes the 21700 battery and offers more power and greater capacity.

Price is shown for one battery.


Note: These batteries are slightly larger than the 18650 battery and are only compatible with 21700 devices.


  • Size: 21700
  • 3700 mAh capacity
  • 3.7 V Nominal Capacity
  • 4.2 V Maximum Voltage
  • Flat Top
  • 21.5 mm by 70.4 mm
  • 30 A Maximum Continuous
  • 35 A Maximum Pulse


  • Battery has potential to catch fire if mistreated.
  • Do not expose to water or fire.
  • Do not short circuit.
  • Keep out of reach of children.
  • Dispose if protective wrap is torn or shows any signs of wear.
  • Do not carry batteries in pocket or purse containing metal objects.
  • Transport batteries in proper battery case.
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MUST BE 21 TO PURCHASE | CALIFORNIA PROPOSITION 65- WARNING: Our products may contain nicotine, a poisonous and highly addictive substance, which is known to the State of California to cause birth defects or other reproductive harm. Keep away from children. Our products are only intended for adults who are of legal smoking age. Individuals who are pregnant or have a preexisting medical condition, which includes, but is not limited to, heart disease, diabetes, high blood pressure or asthma, should not use this product. Nicotine may be poisonous if orally ingested or excessive quantities make contact with skin. Electronic Cigarettes and E Juices are not smoking cessation products and are not intended to prevent or cure any disease or condition. Our products have not been evaluated by the Food and Drug Administration--use at your own risk. Please read our terms of use page for more information.