LG INR21700-M58T (5570 mAh)

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Pajda cz
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LG INR21700-M58T (5570 mAh)

Finally cell which can beat a mythical 800 Wh/l in cylidrical format?

I found this cell on Nkon store https://eu.nkon.nl/rechargeable/li-ion/21700-20700-size/lg-inr21700-m58t... only other source which listed this cell is EVVA http://evva-tech.com/plus/view.php?aid=329&tid=3

Ordered samples from Nkon, I will start cycle life and other tests as soon as it arrives.

FlashPilot
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Im looking forward to your results. Hopefully voltage wont sag too much while under moderate loads. I suspect cycle life will be considerably shorter than most name brand lower capacity cells.

BlueSwordM
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Wait wait wait.

At rated capacity, this is 280Wh/kg, and at minimum capacity, it is 270Wh/kg.

I’ve seen semi-custom form factors reach 300Wh/kg without taking into account lower packaging efficiency(which is functionally the highest with cylindrical cells), so this is impressive.

I wonder what is different about it at the chemistry level.

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

Pajda cz
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Some photos of M58T samples from Nkon. It can be seen that cells were removed from modules, but the welds are nicely cleaned. An interesting feature is the use of a one-side busbar connection in that app, I guess laser was used for welding. The dark circle in the middle of the positive terminal is probably caused by the laser as some surface treatment.

I hope to have first test results today.




man of light
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Pajda cz wrote:
I hope to have first test results today.

Can you check the actual dimensions and post them here? Diameter, length, etc. Because according to the information from NKON and EVVA, it looks like this cell is a bit larger than the usual standard and I’m wondering if it will fit in some of my light where it was a tight fit.

EVVA states 21.80×71.0mm and NKON 21.3×71.0mm.

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tiry31
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Look at the end of Nkon’s page

Nkon

Quote:
Note: Even when charging with 5,000 mA within the described limits above, continuously repeated cycles are not preferred. If the cycles exceeds 10 times, performance and safety cannot be guaranteed

Performance I understand, but safety ?

BlueSwordM
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The one possibility for why safety is an issue is that LG likely found a way to increase the thickness of the electrodes through an innovation internally, but without finding a way to offset the internal resistance loss of such a change.

That would mean the cell gets hotter, losing more cycles, and all of the usual stuff during charging, and they don’t want warranty claims because of that.

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

Oli
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It looks like a very thin positive terminal that’s already bent/ pushed down near the lower left leg in the picture. Flat tops of many cells are not really designed to be abused and or dropped in flashlights even with springs in both ends.

You can't compare the big flashlight in the sky to the little flashlight in your hand.

Pajda cz
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So first results added to the comparison here: https://endless-sphere.com/forums/viewtopic.php?f=14&t=114486

Unfortunately, due to the declared larger dimensions D: 21.7 mm and H: 71 mm, the volumetric energy density is only 768 Wh/l and therefore the “magic” value of 800 Wh/l in cylindrical format still resists. Sad

Pajda cz
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man of light wrote:

Can you check the actual dimensions and post them here? Diameter, length, etc. Because according to the information from NKON and EVVA, it looks like this cell is a bit larger than the usual standard and I’m wondering if it will fit in some of my light where it was a tight fit.

EVVA states 21.80×71.0mm and NKON 21.3×71.0mm.

I can do measurement and weighing on Monday at first. The EVVA dimensions are max. limit values delcared by LG. It seems that Nkon samples used a thicker tube than LG original tube.

Pajda cz
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Pajda cz wrote:
So first results added to the comparison here: https://endless-sphere.com/forums/viewtopic.php?f=14&t=114486

Unfortunately, due to the declared larger dimensions D: 21.7 mm and H: 71 mm, the volumetric energy density is only 768 Wh/l and therefore the “magic” value of 800 Wh/l in cylindrical format still resists. Sad

Actual dimensions of Nkon sample:

with tube: D: 21.6 mm, H: 71.2 mm, Weight: 71.8 g (Nkon transparent tube)
without tube: D: 21.4 mm, H: 70.5 mm, Weight: 70.8 g (this cell have an elevated positive terminal)

So without tube and with 20.3 Wh as measured nominal 0.2C energy it makes exactly 800 Wh/l Smile

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Exciting stuff. Thanks for testing it Pajda. This cell probably can’t be stuffed into an S21A it’s so fat.

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I measured 5700mah from the cell included with my Sofirn LT1 Mini using a SKYRC MC3000. I wonder if they used this cell and rewrapped it. The positive contact looks to be the same shape. https://tgreviews.com/2022/06/30/blf-lt1-mini/#batteries

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Thanks for the shared measurements, that looks interesting to me, I’ll order a few.

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BlueSwordM
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I’d only buy the cell if you were planning not to draw more than 3A TBH.

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

Pajda cz
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Quote:
LG INR21700 M58T (5570 mAh) updated data after first 50 cycles. I have added the data of two more cycles after 50th nominal to show that we will be observing a decent “sawtooth” trend. I’m not surprised by the behavior that cell does not like cycling at lower charging voltages, I’ve just never seen it this strong within LG production. Next to this 95% DoD test (4.15-3.00V) the standard 100% DoD test (4.20-2.50V) runs in parallel and here the cycle life looks very good so far.

You can also check a new thread about simple calendar ageing test results of modern cylindrical cells here: https://endless-sphere.com/forums/viewtopic.php?f=14&t=117028

BlueSwordM
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Anyway, here’s the 1st product that actually seems to use the M58T:
https://youtu.be/-exET7wFWWk

I just searched for LG M58T on Youtube, and found this Silly

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

BlueSwordM
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Also, the M58T’s energy density is quite impressive.

285Wh/kg is nothing to sneeze at.

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

vapcell Dennis
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Pajda cz wrote:
Some photos of M58T samples from Nkon. It can be seen that cells were removed from modules, but the welds are nicely cleaned. An interesting feature is the use of a one-side busbar connection in that app, I guess laser was used for welding. The dark circle in the middle of the positive terminal is probably caused by the laser as some surface treatment.

I hope to have first test results today.




![img]https://i.imgur.com/yaOuzFq.jpg[/img]!

Hello, are the M58 21700 batteries of nkon disassembled from the equipment? Or is there a brand-new M58 without welding marks?

Pajda cz
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vapcell Dennis wrote:

Hello, are the M58 21700 batteries of nkon disassembled from the equipment? Or is there a brand-new M58 without welding marks?

Dissasembled, Nkon says “These batteries are from a canceled car project”. Brand new M58T cells comes in standard LG tube.

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Pajda cz wrote:
vapcell Dennis wrote:

Hello, are the M58 21700 batteries of nkon disassembled from the equipment? Or is there a brand-new M58 without welding marks?

Dissasembled, Nkon says “These batteries are from a canceled car project”. Brand new M58T cells comes in standard LG tube. !{width:50%}http://evva-tech.com/uploads/220519/1-2205191T32O48.png !

Thank you for your information sharing

It may be that large brands of cars are testing the use of batteries, such as Porsche, Mercedes Benz, etc