Test/Review of Windyfire 18650 2000mAh (Green)

9 posts / 0 new
Last post
HKJ
HKJ's picture
Online
Last seen: 6 min 46 sec ago
Joined: 05/24/2011 - 12:23
Posts: 6059
Location: Copenhagen, Denmark
Test/Review of Windyfire 18650 2000mAh (Green)
Windyfire 18650 2000mAh (Green)

DSC_5924

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%)

Windyfire%2018650%202000mAh%20(Green)-info

A fairly low capacity cell without any high current ability.

DSC_5910

DSC_5912DSC_5913

DSC_5915
DSC_5925

Windyfire%2018650%202000mAh%20(Green)-Capacity

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.

Windyfire%2018650%202000mAh%20(Green)-CapacityTimeHours

Windyfire%2018650%202000mAh%20(Green)-CapacityTime

Windyfire%2018650%202000mAh%20(Green)-Energy

Windyfire%2018650%202000mAh%20(Green)-PowerLoadTime

Windyfire%2018650%202000mAh%20(Green)-TripCurrent

Windyfire%2018650%202000mAh%20(Green)-Charge



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

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

lagman
lagman's picture
Offline
Last seen: 5 days 11 hours ago
Joined: 05/13/2014 - 12:24
Posts: 580
Location: France

One review everyday… You are the best!

My English isn’t perfect but I’m trying to improve it. If you see something that doesn’t sound right or is just plain wrong, please feel free to point it out! Smile

dazed1
dazed1's picture
Offline
Last seen: 3 months 5 days ago
Joined: 05/31/2013 - 11:16
Posts: 1557

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

Fenix TK61 MOD> resistor, transistors, copper heatsink, Artic Cooling MX4, dedome, 3A > 5.7A ~ 1700 lumens > (600.000cd)

HKJ
HKJ's picture
Online
Last seen: 6 min 46 sec ago
Joined: 05/24/2011 - 12:23
Posts: 6059
Location: Copenhagen, Denmark

lagman wrote:
One review everyday... You are the best!

dazed1 wrote:
Amazing amount of reviews, great job HKJ, you are a legend :)

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.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

lagman
lagman's picture
Offline
Last seen: 5 days 11 hours ago
Joined: 05/13/2014 - 12:24
Posts: 580
Location: France

Just keep doing what you do, you are a great source of reliable information. Smile
I wish you could add some RC Lipo packs to your comparator in the futur.
http://www.hobbyking.com/hobbyking/store/__9463__Turnigy_4000mAh_4S_20C_...
http://www.hobbyking.com/hobbyking/store/__56847__Multistar_High_Capacit...
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.

My English isn’t perfect but I’m trying to improve it. If you see something that doesn’t sound right or is just plain wrong, please feel free to point it out! Smile

HKJ
HKJ's picture
Online
Last seen: 6 min 46 sec ago
Joined: 05/24/2011 - 12:23
Posts: 6059
Location: Copenhagen, Denmark

lagman wrote:
I wish you could add some RC Lipo packs to your comparator in the futur.

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) .

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

lagman
lagman's picture
Offline
Last seen: 5 days 11 hours ago
Joined: 05/13/2014 - 12:24
Posts: 580
Location: France

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! Smile
Thanks again!

My English isn’t perfect but I’m trying to improve it. If you see something that doesn’t sound right or is just plain wrong, please feel free to point it out! Smile

ryansoh3
ryansoh3's picture
Offline
Last seen: 2 weeks 11 hours ago
Joined: 08/04/2012 - 08:21
Posts: 3876
Location: US

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

Shows similarly poor performance to XXXFire cells.

BLF ≠ B-grade Flashlight Forum

 

HKJ
HKJ's picture
Online
Last seen: 6 min 46 sec ago
Joined: 05/24/2011 - 12:23
Posts: 6059
Location: Copenhagen, Denmark

ryansoh3 wrote:
I don't think these are true IMR, maybe some poor quality ICR cells? Shows similarly poor performance to XXXFire cells.

 

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

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/