Test/Review of Windyfire 18650 2000mAh (Green)

Batteries and Chargers Rechargeable Batteries
1

Windyfire 18650 2000mAh (Green)



Official specifications:

  • Brand/model: Windyfire
  • Type of Battery: IMR 18650/2000mAh
  • Size(mm): 18mm(Diameter) x 65mm(Length)
  • Positive Shape: Button top
  • Weight(g): 42±2g
  • Nominal Voltage: 3.7V
  • Nominal Capacity: 2030mah(0.2 C Discharge)
  • Mininum Capacity: 2000mah(0.2 C Discharge)
  • Discharge Cut-off voltage: 3 V
  • Standard Charge: 0.4 A /4.2V
  • Maximum charge current: 2A
  • Quick Discharge Current: 4A
  • Max Discharge Current: 10A
  • Initial Impedance: Max:40mOhm
  • 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 fairly low capacity cell without any high current ability.










The cell does very good up to 7A, the curves are tracking nicely and with nearly constant capacity. This is a very good result for a 4A rated cell.















Conclusion

The cell looks to be of good quality, but the capacity is fairly low for todays batteries. If the price is low, this cell will be interesting.
This cell gets an acceptable rating.



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

2

One review everyday… You are the best!

3

Amazing amount of reviews, great job HKJ, you are a legend :slight_smile:

4

I have a couple of old reviews laying around, the capacitors was some of them. There might be a few more during the next week.

And I do not expect any lack of reviews in the near future, I have more than 30 batteries in queue, but that will NOT be one each day.

5

Just keep doing what you do, you are a great source of reliable information. :slight_smile:
I wish you could add some RC Lipo packs to your comparator in the futur.

The second link is supposed to be an upgrade in power density. I would love to be able to directly compare the power density of these packs. And compare them with the best 18650, just for comparison. I did some maths calculations already (Wh/Kg), but it is much easier to compare with nice discharge curves.

6

I do not have any actual plans about that, I do also believe my test equipment is on the wimpy end to test that type of battery packs (My loads can only handle 300 Watt) .

7

Too bad, we could really use some accurate data in the RC world.
I guess you already have too much work so I understand you in a way! :slight_smile:
Thanks again!

8

I don’t think these are true IMR, maybe some poor quality ICR cells?

Shows similarly poor performance to XXXFire cells.

9

They do not look like IMR cells, but I will not call them poor quality, they cells match way to good for that.