A123 Systems ANR26650 Grade A vs Grade B - discharge test

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thunderheart   100 W

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A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by thunderheart » Mar 26 2018 3:22pm

Hi guys! I've got 4 ANR26650s - 2 of each grade and tested a pair by discharging at 0.5A (0.2C), 5A, 10A and 20A discharge rates. Then i tested the second pair at 20A and compared all 4 cells.

The cells were bought from Queen Battery. The first pair was bought 4 months ago and the second - a month ago.

As always, I've tested with ZKETECH EBC-A20 and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A.
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I upgraded my holder by replacing the steel pads with pure copper ones (20x20x0.3mm)
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I've followed all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement. Before each discharging cycle each battery was charged at standard current (2.5A) mentioned in the datasheet to 3.6V (cut-off at 0.1A, which is the lowest supported by EBC-A20). Before each discharging or charging i've held a 1-1.5hrs pause. The environment temperature was 20-25°C (23-25°C to be honest).

Discharge cut-off voltage is 2.0V for these batteries.

The Grade A cell has more information on its wrapper than the Grade B one which only is marked "ANR26650"
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and the Grade B's negative pole has no stripes around the metal
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The positive poles are identical
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The Grade A's results:
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The Grade B's results:
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Surprisingly enough, the Grade B cell appears to be slightly better than the Grade A one. So let's compare 2 Grade A cells with 2 Grade Bs at 20A to see if that's a rule or exception
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It seems that both of Grade Bs are better than the more expensive Grade As. Two pairs are not enough to conclude a rule, but at least we can see that the Bs are not worse than As, if not better. Maybe they have reduced cycle life or they are worse at higher discharge rates - i don't know and i have no way to check that. The maximum discharge current i can apply is 20A which i did. I hope this test was useful for ES members :wink:

The video version of this review:


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Hillhater   100 GW

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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by Hillhater » Mar 26 2018 4:36pm

From your results , there looks to be approx a 10-15% difference in the IR between the A and B cells (A being lower).
Maybe that is one of their criteria for grading cells. .?
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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by thunderheart » Mar 26 2018 5:49pm

You mean they are ranging Grade B higher than Grade A? Maybe... But it seems kinda strange to me...
Miboxer C2-4000 smart charger/discharger review: www.youtube.com/watch?v=jrbJceNXv1g
XTAR DRAGON 4-slot charger/discharger review: www.youtube.com/watch?v=S6yVMsIuauE
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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by Pota » Mar 26 2018 6:14pm

Isent it so that the 26650M1B is the more expensive?
Aint the grade A actualy the M1B, with more info?

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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by thunderheart » Mar 26 2018 6:24pm

Yes, it is.
The Grade A (M1B) costs US$5.6 and the Grade B - US$4.6
Miboxer C2-4000 smart charger/discharger review: www.youtube.com/watch?v=jrbJceNXv1g
XTAR DRAGON 4-slot charger/discharger review: www.youtube.com/watch?v=S6yVMsIuauE
Top 21700 cells LG M50 vs Samsung 48G: www.youtube.com/watch?v=KGJDogOG4zw

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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by Hillhater » Mar 26 2018 6:27pm

thunderheart wrote:
Mar 26 2018 5:49pm
You mean they are ranging Grade B higher than Grade A? Maybe... But it seems kinda strange to me...
No. The opposite. A grade has a lower IR than the B grade.
Its only marginal 0.0175 Ohm for A grade, vs 0.020 Ohm for the B grade (All appprox figs)
So the A grade is a better cell in respect to IR.
But there may well be other factors in the grading classification.
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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by thunderheart » Mar 26 2018 6:35pm

Hillhater wrote:
Mar 26 2018 6:27pm
But there may well be other factors in the grading classification.
Maybe... Googling was useless so all i can is just suggest
Miboxer C2-4000 smart charger/discharger review: www.youtube.com/watch?v=jrbJceNXv1g
XTAR DRAGON 4-slot charger/discharger review: www.youtube.com/watch?v=S6yVMsIuauE
Top 21700 cells LG M50 vs Samsung 48G: www.youtube.com/watch?v=KGJDogOG4zw

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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by Pota » Mar 26 2018 6:37pm

Isent M1B like 2500mah and M1A like 2300MAH?

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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by Hillhater » Mar 26 2018 7:31pm

Pota wrote:
Mar 26 2018 6:37pm
Isent M1B like 2500mah and M1A like 2300MAH?
Both cells a M1B models.....but different grades of quality .
Look at the output graphs in the first post, ..
Both output 2500 mAh capacity.
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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by liveforphysics » Mar 26 2018 7:34pm

B grade cells sometimes are slightly higher than expected capacity. Sometimes slightly lower. Most often cells are B grade because something happened that caused a higher than normal self-discharge internal leakage current, which often means they will micro gas inside until premature failure.
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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by Pota » Mar 27 2018 8:24am

Im buying a123 anr26650m1b. Grade A.
They say these are the one original.
Is it fake or not?
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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by thunderheart » Mar 27 2018 12:45pm

Hmmm.... All i can say is that their wrapping differs from my Grade A's
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XTAR DRAGON 4-slot charger/discharger review: www.youtube.com/watch?v=S6yVMsIuauE
Top 21700 cells LG M50 vs Samsung 48G: www.youtube.com/watch?v=KGJDogOG4zw

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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by SamRich » Feb 01 2019 3:48pm

Thanks making those measurements and sharing the results!
Does anyone know what is that opening/hole on the top? A vent?

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Re: A123 Systems ANR26650 Grade A vs Grade B - discharge test

Post by thunderheart » Feb 03 2019 9:54am

SamRich wrote:
Feb 01 2019 3:48pm
Does anyone know what is that opening/hole on the top? A vent?
Should be
Miboxer C2-4000 smart charger/discharger review: www.youtube.com/watch?v=jrbJceNXv1g
XTAR DRAGON 4-slot charger/discharger review: www.youtube.com/watch?v=S6yVMsIuauE
Top 21700 cells LG M50 vs Samsung 48G: www.youtube.com/watch?v=KGJDogOG4zw

:arrow: All my reviews in one place: http://ThunderheartReviews.blogspot.com

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