RE: A123 pack life in real world uses?  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> A123Racing Support >> RE: A123 pack life in real world uses?
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RE: A123 pack life in real world uses? - 2/15/2007 7:49:19 PM   
everydayflyer



Posts: 852
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		Eagle tree just posted Beta 4.44 of their application software which had some bug fixs so I did a test run this morning.
Traxxas Rustler CC Mamba Max 5700 ,3S A123. This was discharge # 171 and I have hammered this pack hard. Watts and Amps. down a bit thismorning as it was 30F and the groud was wet ans slick. Major wheel spins and spin outs.
Logging trigger set at 3A so no recording below that level. (only runtime above 3A recordered). Total clock time was 11-1/2 minutes as I did flip a few tijes and took a couple of 30 second timeouts to check logging triger.

A few days ago I did a full charge in 4:18 and two days ago I did a discharge down to 4volts.

Charles

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< Message edited by everydayflyer -- 2/15/2007 8:29:03 PM >

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RE: A123 pack life in real world uses? - 2/15/2007 7:58:29 PM   
everydayflyer



Posts: 852
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		Here is my 4:18 charge Graph.
Ignor the initial 108A spike(false start).
Note that most of the charge was in the 36 to 30A range.

Charles

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< Message edited by everydayflyer -- 2/15/2007 9:37:55 PM >

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RE: A123 pack life in real world uses? - 2/15/2007 9:10:11 PM   
madmoony


 

Posts: 10
Joined: 1/4/2007
From: Straelen, GERMANY
Status: offline 		Wow,that's impressive! Start current over 108 Amps.That's really a "quick charge".How are the cells performing after that torture?Any sags in capacity or Ri ?

Burkhard

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       Post #: 28

RE: A123 pack life in real world uses? - 2/15/2007 9:36:28 PM   
everydayflyer



Posts: 852
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		I should have noted to ignore that initial spike. The charge started at 78A and quickly droped to apprxox. 36A and then a more natural taper to 30A.

Post righ above charge graph was run approx. 5 cycles after that fast charge.
I do not bother to check IR but I have not seen any difference in performance or capacity.

Charles

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       Post #: 29

RE: A123 pack life in real world uses? - 2/18/2007 5:52:34 PM   
everydayflyer



Posts: 852
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		Here is a link to run ( discharge) #171.

http://www.rcgroups.com/forums/showpost.php?p=6927771&postcount=574

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RE: A123 pack life in real world uses? - 2/19/2007 2:00:36 AM   
SS Pede



Posts: 306
Joined: 2/2/2006
From: Reading, MA, USA
Status: offline 		Even ignoring the spike at the beginning, 30 amps is a HUGE charge current! I'm very impressed that the a123's handle this current without any apparent problems. Most other batts would be toast.

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       Post #: 31

RE: A123 pack life in real world uses? - 2/20/2007 4:13:42 PM   
A123 Racing


 

Posts: 101
Joined: 8/25/2006
From: Hopkinton, MA, USA
Status: offline 		Hey Charles,

I am glad to see that you are happy with your batteries. I am even happier to see you providing all your data to other enthusiasts. I am sure they are grateful. Our batteries are capable of Very high charge currents. There are two things to note when charging with this kind of current. 1.) You should monitor your cell voltages more carefully as charging with higher current can have a greater effect on cell deviation. 2.) This kind of charging will have an impact on your pack’s cycle life. This reason is also why we do not typically charge them with these high currents. We chose 10 amps because 15 minutes is a great charge time, and we want peoples packs to last as long as possible.

Good luck, keep the data coming,

Brian


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RE: A123 pack life in real world uses? - 2/21/2007 4:29:50 PM   
everydayflyer



Posts: 852
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		CBA software has a few strange feactures so first discharge is listed as 185 not 1.
To much trouble to edit so just ignore it.

First discharge was 2190 mAh and the last one was 2100 mAh.

One day this battery will wear out or fail, it has to but for now it continues to impress the you know what out of me.

Added a second Graph (non expanded).



Charles

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< Message edited by everydayflyer -- 2/22/2007 12:38:56 AM >

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       Post #: 33

RE: A123 pack life in real world uses? - 3/6/2007 2:38:21 AM   
Pinolelst


 

Posts: 1477
Joined: 10/5/2004
From: pinole, CA, USA
Status: offline 		I want to see graphs 10 second discharge rates at 100 amps. That's what my hotliner sees climb after climb .... and I want to know if these cells will fit in the same space that a 4s 5000 lipo fits easily in and provide the same performance and longevity....oh..and weigh the same or less at same parameters....and not get beyond slightly warm while doing it...
Thanks for your time

pinolelst

< Message edited by Pinolelst -- 3/6/2007 2:40:50 AM >

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RE: A123 pack life in real world uses? - 3/12/2007 3:57:39 PM   
rivanna


 

Posts: 3
Joined: 1/4/2002
From: Palmyra, VA, USA
Status: offline 		First of all thanks for your info---all contributors!!!I have been using Jeti 77Opto Esc and 2 -11.1 vlt TP4400 packs with an AXI 4120 motor to pqwer a .60 sized Extra 300. Based on what I have read,I started making 4cell A123 packs to act as replacements for th TP's. Will this work and will I have a problem with cutoffs on the ESC. T.I.A.

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       Post #: 35

RE: A123 pack life in real world uses? - 4/7/2007 6:37:42 PM   
adamd11pl


 

Posts: 11
Joined: 2/5/2003
From: Warszawa, POLAND
Status: offline 		Hey Charles,
Any update? Or have you just finish testing on #185?

Regards
Adam

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       Post #: 36

RE: A123 pack life in real world uses? - 4/7/2007 7:13:13 PM   
Red Scholefield



Posts: 4622
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline
quote:

ORIGINAL: Pinolelst

I want to see graphs 10 second discharge rates at 100 amps. That's what my hotliner sees climb after climb .... and I want to know if these cells will fit in the same space that a 4s 5000 lipo fits easily in and provide the same performance and longevity....oh..and weigh the same or less at same parameters....and not get beyond slightly warm while doing it...
Thanks for your time

pinolelst


A123's are probably not for you. Sorry. They are larger and will weigh more and have less capacity. They are for the sport flyer that wants to wear out his 40 size sport plane before the pack wears out.

< Message edited by Red Scholefield -- 5/10/2007 2:20:12 PM >

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RE: A123 pack life in real world uses? - 4/17/2007 6:04:34 PM   
Kraeuterbutter


 

Posts: 26
Joined: 10/10/2003
From: Viennaaustria, AUSTRIA
Status: offline 		@Charles: already past 200 cycles ?

i have already 40cycles in my heli with them..
empty them within 4,5-5min (most times not totally empty) and recharge them with 8A... (most times i get 1800-2000mah back in)

sofar no problems...
like the cells VERY MUCH

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       Post #: 38

RE: A123 pack life in real world uses? - 5/10/2007 8:33:54 AM   
Bass1



Posts: 1579
Joined: 12/26/2002
From: Va.Beach, VA, USA
Status: offline 		Do we have an oppinion change on the a123 cells yet?

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       Post #: 39