Test/Review of Windyfire 18650 2500mAh (Cyan)

Windyfire 18650 2500mAh (Cyan)

Official specifications:

  • Nominal capacity: 2500mAh
  • Nominal voltage: 3.7V
  • Discharge cut-off voltage: 2.5V
  • Standard charge: 4.2V 1000mA
  • Maximum charge current: 4000mA
  • Continuous discharge current: 30A
  • Pulse discharge current: 35A
  • Initial impedance max.: 20mOhm
  • Cycle life: 500cycle to 60%
  • Operating temperature: Charging, 0°C ~ 45°C, Discharging, -20°C~60°C
  • Storage temperature: -20°c -35°c
  • Weight: 45g

Windyfire do also have one of the very popular high current 2500mAh cells.

The discharge curves tracks nicely and as nearly always the specifications are a bit optimistic.


This is a decent high current battery, especially below 20A.

Notes and links

How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Compare to 18650 and other batteries