Efest IMR 21700 4000mAh 30A Rechargeable battery

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If you are a serious vaper you know the benefits of spare fully charged batteries, ready to go whenever or wherever you need them.

21700 batteries are becoming a commonly used battery size for vaporisers. They produce the right amount of voltage and many of them can handle the high-current discharge necessary for vaping.

Let’s start with the basics – Efest batteries are all a very arresting shade of purple but unlike the 18650’s I sell these unfortunately do not come with an included case. These batteries are considered to be safe and powerful performance pieces, but you should treat them with great care and discard any that have punctures or are losing their wrapping.

Battery Specifications:

  • IMR 21700
  • 4000mAh
  • 30A
  • 7v
  • Flat top
  • Li-Mn
  • Length = 70 ± 0.2mm

Nominal Specification:

Battery Type Flat Top
Model IMR 21700V1
Rated Capacity 4000mAh
Nominal voltage 3.7v
Voltage at end of discharge 2.5v
Max charging current 4A
Standard charge 2A
Discharging current 30A
Charging temp range 0°C - 45°C
Discharging temp range 20°C - 75°C
Size 21 (±0.2) mm X 70 (±0.2) mm

Certified by CE, RoHs, MSDS and FCC


x1 Efest IMR 21700 4000mAh 30A Rechargeable battery

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