Test/Review of Windyfire IMR14500 600mAh (Red)

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
9,715
Location
Copenhagen, Denmark
[size=+3]Windyfire IMR14500 600mAh (Red)[/size]

DSC_5894.jpg


Official specifications:
  • Type of Battery: IMR 14500/650mAh
  • Size(mm): 14mm(Diameter) x 50mm(Length)
  • Positive Shape: flat top
  • Weight(g): 20±1g
  • Nominal Voltage: 3.7V
  • Nominal Capacity: 670mah(0.2 C Discharge)
  • Minimum Capacity: 650mah(0.2 C Discharge)
  • Discharge Cut-off voltage: 3 V
  • Standard Charge: 0.4 A /4.2V
  • Maximum charge current: 1.95A
  • Quick Discharge Current: 6.500 A
  • Max Discharge Current: 9.750 A
  • Initial Impedance: Max:20mOhm
  • 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%)

Windyfire%20IMR14500%20600mAh%20(Red)-info.png


This is a high power 14500 cell.

DSC_5893.jpg


DSC_5895.jpg
DSC_5896.jpg


DSC_5897.jpg

DSC_5898.jpg

DSC_5899.jpg


Windyfire%20IMR14500%20600mAh%20(Red)-Capacity.png


The curves tracks fairly well, but there is a small capacity difference between the two cells. They are very impressive in their handling of high currents, capacity is nearly the same, even at 7A and the voltage is fairly high.

Windyfire%20IMR14500%20600mAh%20(Red)-CapacityTimeHours.png


Windyfire%20IMR14500%20600mAh%20(Red)-CapacityTime.png


Windyfire%20IMR14500%20600mAh%20(Red)-Energy.png


Windyfire%20IMR14500%20600mAh%20(Red)-PowerLoadTime.png


Windyfire%20IMR14500%20600mAh%20(Red)-TripCurrent.png


Windyfire%20IMR14500%20600mAh%20(Red)-Charge.png




[size=+3]Conclusion[/size]

These cells are fairly low in capacity, but better than specified. Their high current handling is very good.
I will give them an acceptable rating.



[size=+3]Notes and links[/size]

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
Comparison to other LiIon batteries
 

SubLGT

Flashlight Enthusiast
Joined
Nov 18, 2013
Messages
1,183
Location
Idaho, USA
This is an impressive battery, especially when you consider the price (M.E. has them for $3 each). I compared it to other 14500 batteries at 2A, using the HKJ Comparator, and it outperforms the Sony US14500V 680mAh, the AW IMR14500 600mAh, and the Efest IMR4500 V2 700mAh.

I hope Windyfire has a good QAQC program, so that we can expect similar performance from all samples of this battery.
 

fedcas

Newly Enlightened
Joined
Aug 3, 2006
Messages
69
Location
Lucca, Italy
Seems like the website has changed a bit:

http://www.windyfire.com/search.php?keyword=imr+14500

Now the description talks about 650 mAh (but the picture still shows the 600 mAh version). What does it mean? Is it a new (likely worse) model?

Also, it seems like they have now added another article page (the one at 11.1 USD) for small orders. I think they have raised the price a bit, but it’s still very reasonable (for 4 pcs shipped to EU it’s $15. 9 or $14.1 depending on the EU country).
 
Top