Vapcell INR18650 2900mAh K29 (Purple) 2021

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
9,713
Location
Copenhagen, Denmark
[size=+3]Vapcell INR18650 2900mAh K29 (Purple) 2021[/size]

DSC_4790.jpg


Official specifications:
  • Model: K29
  • Size: 18.3*65.2mm
  • Typical Capacity: 2900mAh (0.2C discharge)
  • Min capacity: 2800mAh (0.2C discharge)
  • Nominal voltage: 3.60V
  • Max Continuous Discharge Current: 20A
  • Max Discharge Current: 35A
  • End-of-charge voltage: 4.20V
  • End-of-discharge Voltage: 2.5V
  • Weight: 48g ( Appr)
  • Internal resistance: 14mOhm ( Appr) AC 1kHz
  • Standard Charge: 1500mA ,CCCV 100mA cut-off
  • Quick Charge Current: 4000mA
%20INR18650%202900mAh%20K29%20(Purple)%202021-info.png


A 18650 cell with decent capacity and current.

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NR18650%202900mAh%20K29%20(Purple)%202021-Capacity.png


The two cells match nicely and can deliver the rated 20A current.

R18650%202900mAh%20K29%20(Purple)%202021-Temp-15.0.png


R18650%202900mAh%20K29%20(Purple)%202021-Temp-20.0.png


02900mAh%20K29%20(Purple)%202021-CapacityTimeHours.png


650%202900mAh%20K29%20(Purple)%202021-CapacityTime.png


0INR18650%202900mAh%20K29%20(Purple)%202021-Energy.png


50%202900mAh%20K29%20(Purple)%202021-PowerLoadTime.png


8650%202900mAh%20K29%20(Purple)%202021-TripCurrent.png


0INR18650%202900mAh%20K29%20(Purple)%202021-Charge.png


20K29%20%28Purple%29%202021-pulse-1.0%2010%2010-IR.png



[size=+3]Conclusion[/size]

The cells looks good and can deliver a good amount of current for the capacity.



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

The batteries was supplied by Vapcell for review.

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
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries
 

knucklegary

Flashlight Enthusiast
Joined
Feb 11, 2017
Messages
1,685
Location
NorCal
Great cells appears they deliver!

Did Vapcell supply case just for the review, or do all their cells come with zipper hard cases?

Thanks for the review! 🧑‍🎄
 

skid00skid00

Newly Enlightened
Joined
Dec 13, 2009
Messages
89
HKJ,

In general, how do you decide the charge amperage. I spent a few hours trying to find mfr documentation on all my batteries (from 10440 to 26650), and some charge currents surprised me. A high-discharge 10440 had a higher charge current than a low-discharge 14500!

And, as always, thanks for another great review. I love the details.
 

skid00skid00

Newly Enlightened
Joined
Dec 13, 2009
Messages
89
HKJ,

In general, how do you decide the charge amperage. I spent a few hours trying to find mfr documentation on all my batteries (from 10440 to 26650), and some charge currents surprised me. A high-discharge 10440 had a higher charge current than a low-discharge 14500!

And, as always, thanks for another great review. I love the details.
 

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
9,713
Location
Copenhagen, Denmark
HKJ,

In general, how do you decide the charge amperage. I spent a few hours trying to find mfr documentation on all my batteries (from 10440 to 26650), and some charge currents surprised me. A high-discharge 10440 had a higher charge current than a low-discharge 14500!

And, as always, thanks for another great review. I love the details.

When testing I use 1A for all most cell, 1400/16340 and smaller is 0.5A.
As a general guideline you can use something between 0.5C and 1C, high current cells can usually be charged much faster that that.
 
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