The Efest 21700 is a rechargeable battery for vaporisers. The term 21700 denotes the actual size/dimensions of the physical battery (21mm x 70mm) with a charging capacity of 4000mAh. These batteries are wrapped and caution should be taken to not damage the outer wrap. Please do not use the battery if this occurs.


  • 4000mAh battery capacity
  • Model: IMR 21700 V1
  • Nominal Voltage: 3.7V
  • Voltage at end of discharge: 2.5V
  • Max charging current: 4A
  • Standard Charge: 2A
  • Discharging current: 30A
  • Charging temperature range: 0C – 45®C
  • Cell Size: 21 (±0,2) mm X 70 (±0.2) mm


  • 21 (±0.2) mm X 70 (±0.2) mm
  • Flat on both ends

In the Box

  • x1 4000mAh 21700mAh Rechargeable Battery
Brand Efest
Shipping Width 0.060m
Shipping Height 0.070m
Shipping Length 0.050m

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