Test/review of Shockli 21700 4000mAh (Black) 2018

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HKJ
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Test/review of Shockli 21700 4000mAh (Black) 2018

Shockli 21700 4000mAh (Black) 2018
DSC_9049
Official specifications:


  • Type of Battery: Shockli 21700 4000mah IMR battery 20A
  • Size(mm): 21.7±0.2mm(Diameter) x 70.9±0.2 mm(Length)
  • Weight(g): 70±2g
  • Nominal Voltage: 3.7V
  • Nominal Capacity: 4000mah (0.2C Discharge)
  • Discharge Cut-off voltage: 2.75 V
  • Standard Charge: 0.3 A~2A (Recommend 0.5 A~1.5A) /4.2V±0.05V
  • Maximum charge current: 2A
  • Continuous Discharge Current: 20A
  • MAX Discharge Current: 30A
  • Initial Impedance: < 20 mOhm
  • Cycle Life: 500times: discharging capacity to 80%
  • Operating environment: Charging, 0°C ~ 45°C, Discharging, -10°C ~ 60°C

Shockli%2021700%204000mAh%20(Black)%202018-info
This is one of the newer cell sizes with more capacity and high current.
DSC_9048
DSC_9050 DSC_9051
DSC_9052
DSC_9053
DSC_9054
Shockli%2021700%204000mAh%20(Black)%202018-Capacity
This is very nice discharge curves with good match and nearly constant capacity, even at high current. I had to stop the 20A and 30A discharge due to heat.
Shockli%2021700%204000mAh%20(Black)%202018-Temp-15.0
Shockli%2021700%204000mAh%20(Black)%202018-Temp-20.0
Shockli%2021700%204000mAh%20(Black)%202018-Temp-30.0
Shockli%2021700%204000mAh%20(Black)%202018-CapacityTimeHours
Shockli%2021700%204000mAh%20(Black)%202018-CapacityTime
Shockli%2021700%204000mAh%20(Black)%202018-Energy
Shockli%2021700%204000mAh%20(Black)%202018-PowerLoadTime
Shockli%2021700%204000mAh%20(Black)%202018-TripCurrent
Shockli%2021700%204000mAh%20(Black)%202018-Charge
Conclusion
These cells can deliver a lot of current and has more capacity than the older 18650 size, the cells has good discharge curves.
Notes and links
The battery was supplied by shockli.com 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
Compare to 18650 and other batteries

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

Splott-Light
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HKJ,
Thanks for your review.
Much appreciated.
Loving the characteristics of these newer sized batteries.
Look forward to more lights being produced to use them.
Cheers,
S-L Smile

P.S. Looks like you may need to upgrade your discharging rig!
Don’t forget to ask us all for funds if you do.
Don’t ask, don’t get!

Ouchyfoot to a New Member: Welcome CJ. Now you have to learn about buying an inexpensive flashlight and modifying it until it either blows up, or starts small fires on the moon…………

Hugh Johnson:
I, too, once lived a tragic and empty life. Then I found [portable] light.
You forgot to mention clothes. I sold most of my clothes to fund my light collection. This is actually fine, since I only go out after dark, and most people can’t see me.
Finally, I got my priorities straight.

Satan@103TFS
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Look very alike LiitoKala 21700 4000mAh may be the same cell.

HKJ
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Splott-Light wrote:
P.S. Looks like you may need to upgrade your discharging rig!

I can discharge with above 100A, the problem is my battery holder, it melts.
I do not with to return to thick copper rods, I like the better precision from a 4 terminal rig.

Splott-Light wrote:
Don’t forget to ask us all for funds if you do. Don’t ask, don’t get!

I have published a paypal address (info@lygte-info.dk), if you want to help me (I am often buying stuff to test and sometimes also new equipment).

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

Pete7874
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HKJ, thanks for the review.

Is it possible to increase the scale on the X axis in your comparator tool? Part of the curve is getting cut off. Thanks!

HKJ
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Pete7874 wrote:
HKJ, thanks for the review.

Is it possible to increase the scale on the X axis in your comparator tool? Part of the curve is getting cut off. Thanks!

Use the 26650 comparator instead: https://lygte-info.dk/review/batteries2012/Common26650comparator.php
20700 & 21700 is also added there.

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

Pete7874
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Thanks!

Agro
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As we’re talking comparators… recently I wanted to compare 18350 and 26650 batteries. None of the comparators has them both

HKJ
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Agro wrote:
As we’re talking comparators… recently I wanted to compare 18350 and 26650 batteries. None of the comparators has them both

They are too far from each other, it would not be meaningful to put them in the same comparator.

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

Agro
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HKJ wrote:
Agro wrote:
As we’re talking comparators… recently I wanted to compare 18350 and 26650 batteries. None of the comparators has them both

They are too far from each other, it would not be meaningful to put them in the same comparator.


If I have a 26350 light what is the best high-current battery for it?

Aspire 18350.

No, I don’t think they are far from each other. They are one-way compatible and have competitive performance.

HKJ
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Agro wrote:
HKJ wrote:
Agro wrote:
As we’re talking comparators… recently I wanted to compare 18350 and 26650 batteries. None of the comparators has them both

They are too far from each other, it would not be meaningful to put them in the same comparator.


If I have a 26350 light what is the best high-current battery for it?

Aspire 18350.

No, I don’t think they are far from each other. They are one-way compatible and have competitive performance.

You asked about a 26650 battery compare to a 18350 battery, that is a 4000-5000mAh compared to a 1000mAh battery, and they are very different in size.
Comparing 26350/18350 may be more interesting, but I have only tested one 26350.

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

Agro
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HKJ wrote:
Agro wrote:
HKJ wrote:
Agro wrote:
As we’re talking comparators… recently I wanted to compare 18350 and 26650 batteries. None of the comparators has them both

They are too far from each other, it would not be meaningful to put them in the same comparator.


If I have a 26350 light what is the best high-current battery for it?

Aspire 18350.

No, I don’t think they are far from each other. They are one-way compatible and have competitive performance.

You asked about a 26650 battery compare to a 18350 battery, that is a 4000-5000mAh compared to a 1000mAh battery, and they are very different in size.
Comparing 26350/18350 may be more interesting, but I have only tested one 26350.


Typo. I meant 26350. Smile