Test/review of Shockli 21700 3800mAh (Green) 2018

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HKJ
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Test/review of Shockli 21700 3800mAh (Green) 2018

Shockli 21700 3800mAh (Green) 2018

DSC_6897

Official specifications:


  • Model : Shockli IMR 21700 3800mAh 40A
  • Capacity: 3800mAh
  • Voltage: 3.7V
  • Discharge Cut-off voltage: 2.75V
  • Standard Charge: 0.3 A~3A (Recommend 0.5 A~1.5A) /4.2V±0.05V
  • Maximum charge current: 3A
  • Continuous Discharge Current: 30A
  • MAX Discharge Current: 40A
  • Impedance: 15 m?
  • Positive: Flat Top
  • Size(mm): 21.5±0.2mm(Diameter) x 70.5mm±0.2mm(Length)
  • Weight(g): 71±2g
  • Cycle Life: 500times to 70%

Shockli%2021700%203800mAh%20(Green)%202018-info

The new size battery in a high capacity, but also rated for high current.

DSC_6902DSC_6896

DSC_6898DSC_6899

DSC_6900
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Shockli%2021700%203800mAh%20(Green)%202018-Capacity

The discharge curves matches very well and the cell has nearly constant capacity independent of load, but it gets rather warm at 30A.

Shockli%2021700%203800mAh%20(Green)%202018-Temp-15.0

Shockli%2021700%203800mAh%20(Green)%202018-Temp-20.0

Shockli%2021700%203800mAh%20(Green)%202018-Temp-30.0

Shockli%2021700%203800mAh%20(Green)%202018-CapacityTimeHours

Shockli%2021700%203800mAh%20(Green)%202018-CapacityTime

Shockli%2021700%203800mAh%20(Green)%202018-Energy

Shockli%2021700%203800mAh%20(Green)%202018-PowerLoadTime

Shockli%2021700%203800mAh%20(Green)%202018-TripCurrent

Shockli%2021700%203800mAh%20(Green)%202018-Charge



Conclusion

The cell is a very good high current battery with good capacity and has better performance than any 18650 cell and up to 20A it is also one of the good batteries in the new sizes (20700/21700)



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/

MRsDNF
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Thanks for the review HKJ. Thumbs Up

My current and or voltage measurements are only relevent to anything that I measure.

Budget light hobby proudly sponsored by my Mastercard and unknowingly paid for by a hard working wife. 

djozz said "it came with chinese lettering that is chinese to me".

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Splott-Light
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HKJ,

Thanks for testing these.

Looks like this new size is really starting to take off.

Loved the (under)statement: “the cell has nearly constant capacity independent of load, but it gets rather warm at 30A”

I read the graphs and was thinking “Wow”, seemed almost totally unworried by the load put on it!

Cheers,
S-L Smile

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…………

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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.

DavidEF
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Looking nice! I agree with Splott-Light

Quote:
Looks like this new size is really starting to take off.

Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
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Barkuti
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The specs are exaggerated, namely current handling. Looking at the temperature graphs, both cells went way above +50°C at 20A. Thus, 0K consistency, less than 20A continuous and ≈3700mAh, and I'm being magnanimous. 

Is the Lii-40A review coming close?

 

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HKJ
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Barkuti wrote:

The specs are exaggerated, namely current handling. Looking at the temperature graphs, both cells went way above +50°C at 20A. Thus, 0K consistency, less than 20A continuous and ≈3700mAh, and I’m being magnanimous. 

Yes, current handling is exaggerated, but that do not prevent it from being a good high current cell.

Barkuti wrote:

Is the Lii-40A review coming close?


 


Cheers Smile

Yes, I have one more battery in queue before it.

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

EasyB
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This seems like a nice combination of capacity and high-drain. Fits in between the Samsung 21700 30T and 48G.

nofearek9
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thanks for the review ,another nice battery from Shockli.

Barkuti
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These cells maybe are from the same OEM as the cell under the Lii-40A wrap. Had a couple Lii-40As weeks ago, bought them for a friend. Measured 3865 and 3898mAh in a Lii500's 0.5A discharge ratio NOR test, and their average internal resistance score was slightly below that of Samsung 30Q cells. 

 

Cheers Party

contactcr
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Vapcell/Golisi/iJoy/Efest/Basen all have very similar batteries on paper to this one.

With Samsung/Sanyo on board with the 20/21700 size as well as the Vape industry we, as flashlight people, should officially declare 26650 dead. I see no purpose making future lights with that cell. It’s a “vape only” format w/ no real buy in from other industry.

Couchmaster
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3800 mah is nice, but weren’t the recent 26650 in the 5000 mah range? Regardless, because Tesla is going 21700 as will other car makers, I expect that’s going to see some huge increases in power and longevity in that form factor the next few years. Which may mean that 18650 eventually goes away?

contactcr
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Couchmaster wrote:
3800 mah is nice, but weren’t the recent 26650 in the 5000 mah range? Regardless, because Tesla is going 21700 as will other car makers, I expect that’s going to see some huge increases in power and longevity in that form factor the next few years. Which may mean that 18650 eventually goes away?

Samsung 48G is already 4800mah @ 10A and we are in 21700 infancy.

Of course you will find a bit higher mah battery in 26650 size but that’s because it’s huge not because it’s superior construction or something. Give it time and im sure you will see some new technology that brings them much closer together since it has such big companies backing it.

Agro
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contactcr wrote:
Couchmaster wrote:
3800 mah is nice, but weren’t the recent 26650 in the 5000 mah range? Regardless, because Tesla is going 21700 as will other car makers, I expect that’s going to see some huge increases in power and longevity in that form factor the next few years. Which may mean that 18650 eventually goes away?

Samsung 48G is already 4800mah @ 10A and we are in 21700 infancy.

Of course you will find a bit higher mah battery in 26650 size but that’s because it’s huge not because it’s superior construction or something. Give it time and im sure you will see some new technology that brings them much closer together since it has such big companies backing it.


No, 48G is just under 4600 mAh @ 10A. It’s 4700 mAh with minimal load.
Vapcell Purplue 5000 (probably rewrap of LG INR21700H30) is 4800 mAh with minimal load.
shadockan
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If I’m not wrong, comparing the poles of the Lii 40 and the positive pole of Shockli with the Basen 21700 4000mAh, I see that they look very much.
So theoretically they can be the same batteries.

Basen 21700 4000mAh is a battery made by Chinese Lishen which indicates that the battery is capable of 12 Amperes.

I measured the battery (Basen) , I saw that with 15A it had a temperature rise of 65 ° C.

***However, it may have been a bit higher temperature because I’m not absolutely sure about the temperature sensor, because of a low friction***

However, in general use of the battery with demand at ± 18 A with intermittent discharge, I did not see any worrying temperature.

So if the Lii 40 and the Shockli have the same element as Basen, then we are talking about Lishen batteries.
Until we see the large manufacturers’ batteries in the market, I think it’s a good solution.

Shockli-Simon
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contactcr wrote:
Couchmaster wrote:
3800 mah is nice, but weren’t the recent 26650 in the 5000 mah range? Regardless, because Tesla is going 21700 as will other car makers, I expect that’s going to see some huge increases in power and longevity in that form factor the next few years. Which may mean that 18650 eventually goes away?

Samsung 48G is already 4800mah @ 10A and we are in 21700 infancy.

Of course you will find a bit higher mah battery in 26650 size but that’s because it’s huge not because it’s superior construction or something. Give it time and im sure you will see some new technology that brings them much closer together since it has such big companies backing it.

First of all, thank HKJ for his hard work.
New Energy vehicles are currently a very popular Industry in China .Tesla states that 21700 can reduce costs in car makers ,So the Energy vehicles factory in china also want reduce cost ,they Require battery factory to produce 21700 cells .

More factories that will produce the 21700 battery in china,and new technology that brings more capacity and higher discharge current .
I didn’t see 21700 battery apply on the flashlight.but it had applyed for E-CIG .