inconsistent M1 cell data...?!?! (Full Version)

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

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



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

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




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

Here is another Graph showing a 4 cell pack under a 40A load.



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

Dang, I have to get one of them and a GPS!



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