Australian Customers: Due to shipping restrictions, we can send a maximum of 2 batteries via DHL only (no AusPost unfortunately).


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Looking for an all-day battery that keeps running, and running, and running...? The Efest 21700 has a MASSIVE capacity of 3,700mAh, which will keep you running for a very long time! Please not that these cells will only fit 21700-compatible devices. Contact Us if you're unsure!

See here for a detailed review by Mooch.


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Product Specs
Product Name [!!!] Efest 21700
Brand Efest
Nominal Voltage 3.7V
Nominal Capacity 3700mAh
Max. Discharge 35A Continuous
Chemistry IMR
Size 21700
In the Box
  • 1xEfest 21700 Battery
  • 1xInsulating Battery Case