thunderheart
Member
- Joined
- Apr 4, 2018
- Messages
- 276
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 fromQueen Battery. The first pair was bought 4 months ago and the second - a month ago.
As always, I've tested withZKETECH EBC-A20and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A.
The tests were done using v.2.0 of my holder with pure copper pads (20x20x0.3mm)
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 inthe datasheetto 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 20-25C (23-25C to be honest).
Specifications from A123 Systems ANR26650M1Bofficial 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: 6m?
Weight: 76g
The Grade A cell has more information on its wrapper than the Grade B one which only is marked "ANR26650"
and the Grade B's negative pole has no stripes around the metal
The positive poles are identical
The Grade A's results:
The Grade B's results:
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
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[img=15x17]https://endless-sphere.com/forums/images/smilies/icon_e_wink.gif[/img]
The video version of this review:
Check outmyYouTube channelfor batteries, chargers and other stuff reviews.
I've launchedmy blogwhere 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.
The cells were bought fromQueen Battery. The first pair was bought 4 months ago and the second - a month ago.
As always, I've tested withZKETECH EBC-A20and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A.
The tests were done using v.2.0 of my holder with pure copper pads (20x20x0.3mm)
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 inthe datasheetto 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 20-25C (23-25C to be honest).
Specifications from A123 Systems ANR26650M1Bofficial 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: 6m?
Weight: 76g
The Grade A cell has more information on its wrapper than the Grade B one which only is marked "ANR26650"
and the Grade B's negative pole has no stripes around the metal
The positive poles are identical
The Grade A's results:
The Grade B's results:
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
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[img=15x17]https://endless-sphere.com/forums/images/smilies/icon_e_wink.gif[/img]
The video version of this review:
Check outmyYouTube channelfor batteries, chargers and other stuff reviews.
I've launchedmy blogwhere 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.
