inconsistent M1 cell data...?!?!  
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inconsistent M1 cell data...?!?! - 11/25/2006 12:55:31 AM   
zeropointbug


 

Posts: 7
Joined: 11/22/2006
From: tisdale, SK, CANADA
Status: offline 		Hi all,

If anyone has noticed like i have, trying to post data on M1 cell performance, will be down right confused between the sources.



I have seen (from A123 website) that the cell maintains 2.7 volts at the rated 30C (70 amps) discharge

I have also seen a voltage of 2.69 volts at a 42 amp discharge...

I have also seen 2.5 volts at 30C (70 amp) discharge...?



I, personally, have had a VERY good experience with these cells and think that these cells hold their voltage higher, somewhere in the range of 2.7 volts with a 40 amp draw. And current draw unlike anything else with PLENTY of torque under acceleration. A little higher top speed than 12 cell NiMH, but the MUCH more torque. This leads me to believe that they hold there voltage up there. (5s2p)

Zero

< Message edited by zeropointbug -- 11/25/2006 12:56:44 AM >
       Post #: 1

RE: inconsistent M1 cell data...?!?! - 11/25/2006 3:02:43 AM   
everydayflyer



Posts: 854
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		Ever hear of Steve Neu?

http://www.rcgroups.com/forums/showpost.php?p=6095966&postcount=93

Snip

quote:

The A123 cells which are rated for 2300 mah give up 2150mah at 10C discharge. The voltage at 10C is 2.85 volts/cell. At 20C the voltage/cell is 2.5 at the mid discharge point.

Steve Neu




One of my Data Logger Graphs.

This graph run # 2 of 3 runs from a singl charge .780 start -1400 mAh end.

Start 34 A, end 30A / start V 9 end V 8. 8/3=2.66



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< Message edited by everydayflyer -- 11/25/2006 3:26:24 AM >

(in reply to zeropointbug)
       Post #: 2

RE: inconsistent M1 cell data...?!?! - 11/25/2006 5:24:01 PM   
everydayflyer



Posts: 854
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		Here is another Graph showing a 4 cell pack under a 40A load.

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< Message edited by everydayflyer -- 11/25/2006 5:25:02 PM >

(in reply to everydayflyer)
       Post #: 3

RE: inconsistent M1 cell data...?!?! - 11/26/2006 3:18:12 AM   
Marv829


 

Posts: 28
Joined: 5/23/2004
From: Worthington, IA, USA
Status: offline 		Dang, I have to get one of them and a GPS!

< Message edited by Marv829 -- 11/26/2006 3:19:11 AM >

(in reply to everydayflyer)
       Post #: 4

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