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A123 Systems ANR26650 Grade A vs Grade B - discharge test
#1
Video 
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.
[Image: 100_9607.jpg]

The tests were done using v.2.0 of my holder with pure copper pads (20x20x0.3mm)
[Image: 132366_original.jpg]

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).

Specifications from A123 Systems ANR26650M1B official datasheet (pdf):
Nominal capacity: 2500mAh
Minimum capacity: 2400mAh
Nominal voltage: 3.3V
Standard charge current: 2.5A
Rapid charge current: 10A
Charge end voltage: 3.6V
Max continuous discharge current: 70A
Max pulse discharge (10 sec): 120A
Discharge cut-off voltage: 2.0V
AC impedance at 1KHz: 6mΩ
Weight: 76g

The Grade A cell has more information on its wrapper than the Grade B one which only is marked "ANR26650"
[Image: 132811_original.jpg]

and the Grade B's negative pole has no stripes around the metal
[Image: 132896_original.jpg]

The positive poles are identical
[Image: 133188_original.jpg]

The Grade A's results:
[Image: 133609_original.png]

The Grade B's results:
[Image: 133748_original.png]

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
[Image: 133906_original.png]

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 you [Image: icon_e_wink.gif] 

The video version of this review:
[Image: 251082_original.jpg]


Check out my YouTube channel for batteries, chargers and other stuff reviews.
I've launched my blog where you can find all my reviews in one place. Every new test/review will be first published on YouTube and in the blog. I'll be happy to see new subscribers, comments, suggestions and just your thoughts.
Korishan likes this post
LiFePO4: QB26650 2500mAh 50A vs A123 ANR26650M1B: https://youtu.be/GOSkte11lRc

Yinlong LTO Lithium Titanate safety tests: https://youtu.be/eAUYbSDEy6I
Toshiba SCiB LTO Lithium Titanate safety tests: https://youtu.be/XsrRDZxEFQE

XTAR DRAGON 4-slot battery tester review: https://youtu.be/S6yVMsIuauE
Miboxer C4-12 4 slot x 3.0A charger review: https://youtu.be/X-ww1YALjvU
Miboxer C2-4000 smart battery tester review: https://youtu.be/jrbJceNXv1g

Samsung 33J for TESLA: https://youtu.be/7FMxgMmPeh4
Samsung 40T - a high drain 35A 21700 cellhttps://youtu.be/lxgKWiQ9580
Reply
#2
could this simply be an age difference?
or not a grade difference but the b simply being a oem cell destined for another a123 product like a pack?
Reply
#3
Everything is possible
LiFePO4: QB26650 2500mAh 50A vs A123 ANR26650M1B: https://youtu.be/GOSkte11lRc

Yinlong LTO Lithium Titanate safety tests: https://youtu.be/eAUYbSDEy6I
Toshiba SCiB LTO Lithium Titanate safety tests: https://youtu.be/XsrRDZxEFQE

XTAR DRAGON 4-slot battery tester review: https://youtu.be/S6yVMsIuauE
Miboxer C4-12 4 slot x 3.0A charger review: https://youtu.be/X-ww1YALjvU
Miboxer C2-4000 smart battery tester review: https://youtu.be/jrbJceNXv1g

Samsung 33J for TESLA: https://youtu.be/7FMxgMmPeh4
Samsung 40T - a high drain 35A 21700 cellhttps://youtu.be/lxgKWiQ9580
Reply
#4
Maybe A and B are generation markers, like Samsung's P/Q/R or B/C/D/E/F for example.
Reply
#5
ANR26650M1B cells now are being manufactured and sold under Lithium Werks brand. In March 2018 Lithium Werks acquired A123 Systems' industrial business and manufacturing plants located in Changzhou, China. These plants were the first to introduce the revolutionary NanoPhosphate® technology in the form of cylindrical cells.
[Image: 261941_original.jpg]

The new datasheet (Jan 2019) for Lithium Werks ANR26650M1B: 
.pdf   Lithium_Werks_ANR26650M1B_datasheet.pdf (Size: 553.84 KB / Downloads: 23)

The v.2 (MD100113-02, 2012) datasheet for A123 Systems ANR26650M1B: 
.pdf   A123 Systems ANR26650M1B MD100113-02 2012.pdf (Size: 2.86 MB / Downloads: 18)
LiFePO4: QB26650 2500mAh 50A vs A123 ANR26650M1B: https://youtu.be/GOSkte11lRc

Yinlong LTO Lithium Titanate safety tests: https://youtu.be/eAUYbSDEy6I
Toshiba SCiB LTO Lithium Titanate safety tests: https://youtu.be/XsrRDZxEFQE

XTAR DRAGON 4-slot battery tester review: https://youtu.be/S6yVMsIuauE
Miboxer C4-12 4 slot x 3.0A charger review: https://youtu.be/X-ww1YALjvU
Miboxer C2-4000 smart battery tester review: https://youtu.be/jrbJceNXv1g

Samsung 33J for TESLA: https://youtu.be/7FMxgMmPeh4
Samsung 40T - a high drain 35A 21700 cellhttps://youtu.be/lxgKWiQ9580
Reply


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