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A123 capacity test - 10/2/2007 4:43:54 PM   
rajul



Posts: 6131
Joined: 6/18/2002
From: Missouri City, TX, USA
Status: offline 		Hi, what discharge rate and minimum voltage should be used to check the capacity of a A123 cell? Thx

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RE: A123 capacity test - 10/2/2007 4:49:31 PM   
guver


 

Posts: 8414
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: online 		The factory is using 1,10,30,40 amps and 2 volts according to the chart. I'd try to match that. Or can set your own standard close to your real world conditions.

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RE: A123 capacity test - 10/2/2007 4:56:05 PM   
rajul



Posts: 6131
Joined: 6/18/2002
From: Missouri City, TX, USA
Status: offline 		Does the cell get damaged if the voltage goes below 1V?

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RE: A123 capacity test - 10/2/2007 5:25:54 PM   
guver


 

Posts: 8414
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: online 		not sure, well maybe somewhat. I've seen many cycles,abuses posted with very little damage. They sure are a lot heartier than a lipo.
Much more forgiving for under/over voltage.

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RE: A123 capacity test - 10/11/2007 4:50:39 PM   
everydayflyer



Posts: 889
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		2 volts per cell LVC is the recomended min. however myself and others have gone lower.
One single cell test on RC Groups was to charge to 4.3 and discharge to 0 (zero).

Cells should no be left discharge below 2 V and 3.3 is the standard storage voltage. With packs balance should be monitoried especially when discharged more than 2000 mAh which is the point where imbalance starts to get bad with some packs.

Charles

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RE: A123 capacity test - 10/11/2007 7:01:55 PM   
Red Scholefield



Posts: 4732
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline
quote:

ORIGINAL: rajul

Hi, what discharge rate and minimum voltage should be used to check the capacity of a A123 cell? Thx


Manufacturers usually set the rating at C/10 discharge. For all practical purposes there is little capacity left below 2.5 volts so to be safe set this as you cut off. Realize that the higher the discharge rate the lower you can go in the cut off voltage without damaging the cells.

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RE: A123 capacity test - 10/24/2007 2:51:47 PM   
everydayflyer



Posts: 889
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		One should also be aware that battery temperature will effect discharge capacity and voltage curve.Much like LiPolys and Ni cells these perform beter when a little warm.

Attached is acouple of old CBA Graphs of mine showing difference at 11.5A discharge rate and two different temps.



Charles

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< Message edited by everydayflyer -- 10/24/2007 2:57:57 PM >

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