This product has been discontinued

Efest 21700 3700mAh Battery

Availability: Sorry, this item or particular colour or type is out of stock

A high drain 21700 battery from Efest.

NB: This listing is for a single battery.


  • Hybrid IMR chemistry
  • 3700mAh capacity
  • 30A amp limit *

* Efest markets this battery as having a 35A amp limit, however this rating has been proven to be exaggerated.

The Efest 21700 has been tested by Mooch, results available here.

Please read our battery safety warnings before purchasing.

WARRANTY: DOA only. Warranty information →