[HKJ]

Windyfire 18650 2600mAh (Green)



Official specifications:

• Brand/model: Windyfire
• Type of Battery: ICR 18650/2600mAh
• Size(mm): 18mm(Diameter) x 65mm(Length)
• Positive Shape: flat top
• Weight(g): 49±1
• Nominal Voltage: 3.7V
• Nominal Capacity: 2630mah(0.2 C Discharge)
• Minimum Capacity: 2600mah(0.2 C Discharge)
• Discharge Cut-off voltage: 3 V
• Standard Charge: 0.5 A /4.2V
• Maximum charge current: 2.6 A
• Quick Discharge Current: 5.2A
• Max Discharge Current: 7.8 A
• Initial Impedance: 40-55mOhm
• Cycle Life: 310times: discharging capacity>85%, 510times: discharging capacity>60%
• Temperature Characteristics: -10°C/0.2C >80% Capacity; 20°C/0.2C =100% Capacity;60°C/0.2C >95%* Capacity
• Charging Time: Standard charge : 5-7hours, Rapid charge : 2-3hours
• Operating environment: Charging, 0°C ~ 45°C ; 65±20%RH, Discharging, -20°C~60°C ; 65±20%RH
• Storage environment: Temp(-20°c -35°c) / Relative humidity (45-75%)

A medium capacity 18650 battery, with full specifications.










Good looking curves, the two cells tracks nicely and capacity varies only a little bit with load.















Conclusion

These 2600mAh cells has very good performance and I will rate them as acceptable.



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