Test/review of LiitoKala 21700 4000mAh Lii-40A (Yellow)

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HKJ
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Test/review of LiitoKala 21700 4000mAh Lii-40A (Yellow)

LiitoKala 21700 4000mAh Lii-40A (Yellow)
DSC_7165
Official specifications:


  • Model: Lii-40A
  • Size: 21700
  • Chemistry: IMR
  • Nominal Capacity: 4000mAh
  • Nominal Voltage: 3.6V
  • Discharge: 40A Max Continuous
  • Positive: Flat
  • Rechargeable: Yes
  • Dimensions: 21.2mm x 70.4mm
  • Weight: 61.2g

LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-info
High current 21700 cells from LiitoKala and also with good capacity.
DSC_7164
DSC_7166 DSC_7167
DSC_7168
DSC_7169
LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-Capacity
The two cell matches discharge curves fairly well and capacity is nearly constant at any load.
LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-Temp-15.0
The cells get warm at high current.
LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-Temp-20.0
LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-Temp-30.0
I do not know exactly what happend with the B cell, but my battery holder was melted, i.e. the strange curve is probably due to a damaged battery holder and not the cell.
LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-CapacityTimeHours
LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-CapacityTime
LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-Energy
LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-PowerLoadTime
LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-TripCurrent
LiitoKala%2021700%204000mAh%20Lii-40A%20(Yellow)-Charge
Conclusion
The cells has the rated capacity and capacity is fairly constant with load, but they do get rather hot at high current. This means they may handle high pulse current, but 20A or more in constant current is not a good idea.
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/

Edited by: HKJ on 05/08/2018 - 11:31
Agro
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Oh yeah, I waited for this test. Good battery in general and very good for the price.
Thanks HKJ!

Henk4U2
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Thank you for yet another review. It seems that my Samsung INR21700-48G is still best choice as long as I don’t exceed 10-12A.

You are a flashaholic if you are forced to come out of the closet, to make room for more flashlights.

Barkuti
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Well, a Lishen cell with almost 4Ah and a 3C rating. 

It's appeal lies in its demolition class price LoL.

 

Cheers Party

The Light Innocent I am

Agro
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$7.05 / 2 pieces for the next 2 weeks:
https://www.aliexpress.com/item/LiitoKala-Lii-40A-3-7V-21700-4000mAh-14-...PCB/32846442786.html
Is that a good price?

Satan@103TFS
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Agro wrote:
$7.05 / 2 pieces for the next 2 weeks: https://www.aliexpress.com/item/LiitoKala-Lii-40A-3-7V-21700-4000mAh-14-...PCB/32846442786.html Is that a good price?

Not for TH with 26.32$ shipping.

BlueSwordM
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If you are in the US, then it is the best deal on lithium ion cells I have found outside of bulk purchases.

Otherwise, I will continue ordering from there:
https://sunway.aliexpress.com/store/3173029?spm=2114.12010108.0.0.5de455...

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

Satan@103TFS
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There are 2 colors of Liitokala Lii-40A yellow and pink ,are they the same?

Nicolaas
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HKJ: considering the high capacity of 20700&21700 cells, shouldn’t you put them in your 26650/32650 list rather then with the 18650 cells?

Thanks for all your testing: it really helps us out to decide what to buy!

Cheers,
Nico

JasonWW
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Nicolaas wrote:
HKJ: considering the high capacity of 20700&21700 cells, shouldn’t you put them in your 26650/32650 list rather then with the 18650 cells?

The Lii-40A are already in both lists.

Or do you mean all 20700 and 21700?

JasonWW
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Satan@103TFS wrote:
There are 2 colors of Liitokala Lii-40A yellow and pink, are they the same?

Are you sure? Do you have the pink ones or know some place selling them?

It seems they are all yellow at the moment. If you have info about the pink, I would like to find out about it.

Satan@103TFS
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JasonWW wrote:
Satan@103TFS wrote:
There are 2 colors of Liitokala Lii-40A yellow and pink, are they the same?

Are you sure? Do you have the pink ones or know some place selling them?

It seems they are all yellow at the moment. If you have info about the pink, I would like to find out about it.

Many of the pink one.
https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_2018061201...

HKJ
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Nicolaas wrote:
HKJ: considering the high capacity of 20700&21700 cells, shouldn’t you put them in your 26650/32650 list rather then with the 18650 cells?

They are in both lists, but I usual forget to change the link at the bottom (It is auto generated to the 18650 list).
I have just added a link in the 18650 comparator to the 26650 comparator, hopefully this will help with this.

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

JasonWW
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Satan@103TFS wrote:
JasonWW wrote:
Satan@103TFS wrote:
There are 2 colors of Liitokala Lii-40A yellow and pink, are they the same?

Are you sure? Do you have the pink ones or know some place selling them?

It seems they are all yellow at the moment. If you have info about the pink, I would like to find out about it.

Many of the pink one.
https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_2018061201...


Okay, I see.

My suggestion is to buy the yellow since it was the one HKJ tested. The pink might be identical, but why take that chance?

I personally would just buy the yellow.