Test/Review of King Kong ICR26650 4200mAh (Gold)

King Kong ICR26650 4200mAh (Gold)



Official specifications:

  • Flat Top
  • Volt: 3.7v
  • Capacity: 4200mAh
  • Size:26mmx66mm.
  • Charge current<=1A
  • Weight 95 g




This battery is a unprotected 26650 battery, it does surpass the capacity specification.










The cells does not track perfectly, it looks like it is a resistance difference and not a capacity difference.











These cells does easly deliver 15A

1-sep-2013 19:23



Conclusion

The capacity has been increased compared to the 4000mA (As expected), but not with 200mAh (The 4000mAh did also have more capacity than rated).
The cell has a good performance, but they have a slightly different voltage when loaded.
I will rate this battery 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

Thanks!
Awesome as always!

Thanks for releasing the results so quick HKJ! :party:

As far as I can tell this is the best 26650 you have tested so far? To me it looks that way, especially if high discharge, 5-10A, and high capacity is the goal. Do you agree?

The difference in discharge curves have been seen on several types of 26650 batteries it seems.

As long as you want high capacity, yes, but for high voltage and current the Sony and Efest do also look good.

Thanks for doing this!

Great review, thanks HKJ. Interesting that the capacity seems to be one of the highest in an IMR 26650

What’s up with the sag of the second battery at 10a? (The orange line)

Is there something wrong with the cell?

From 2A and upwards you can see an increasing distance between the discharge curves, this is due to a slight difference in internal resistance. I do not believe there is anything wrong with the cell, only some production tolerances.

Thanks HKJ!

-Garry

That salmon curve is strange, never seen anything like that in your reviews. So change in internal resistance during discharge causes the voltage to oscillate like that ?

You are talking about the jumps in the curve?

I do not know what it is, but it might be something with the chemistry. It could also be a "loose" (We are talking about 1mOhm change, this does usual not qualify as a loose connection) connection in my battery clamp, but I have not moved the clamp between the curves and it is not present in the other curves (Or any of my other battery tests).

Yes, exactly, there’s a sudden drop in voltage at 2,7Ah with a slight recovery around 3,1Ah and the same at 4,1 and 4,25Ah.
What a monday mystery.