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Old May 25, 2001, 12:23 AM
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NEW CP-2400SCR versus RC2400


OK. Here we go: http://www.eflightpower.com/cp_rc_2400_1.htm

<img src="http://www.eflightpower.com/media/tests/CP2400_vs_RC2400_comp.gif" width="573" height="638">

These are 8 cell packs at about 10 amps. Higher amps will be used for more testing, about 20. The AF 112D charger puts about 2800 mah in them at 3.6 amps current.
The same charger at the same current and same discharge load was used on all tests.

Very interesting, eh. Almost identical, and so far better, than the RC2400 we have tested. These are 2 packs of the RC2400 and 2 packs of the CP-2400SCR, charged/discharged at least 5 times.

Shawn
Eflightpower.com
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Old May 25, 2001, 08:15 AM
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I'd like to see 30 and 40A curves.
..a
Old May 25, 2001, 09:10 AM
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Here's 20A. At 20A, the RC2400 is 4.4mOhm, the CP-2400SCR is 5.3mOhm. This difference will show up more at higher currents.

I've got 35A done, I'll post it tonight.

See complete data at www.magtechinc.net/Cells.htm

Old May 25, 2001, 11:04 AM
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500A and real 500AR test the same at 5A, but 500A completely falls apart at 10A. Don't even bother running the 500A at 15 or 20A which the 500AR would tolerate well.

A curve at 30-40A is much more realistic.

Greg
Old May 25, 2001, 05:03 PM
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Well, here is the curve for 2 CP and 2 RC packs for 25 amps. I do not think that the second CP pack peaked correctly, it was not as warm as the others. 35 AMP tests will be coming tomorrow.

<img src="http://www.eflightpower.com/media/tests/cp_rc_25amp.gif" width="515" height="517">

Shawn
Eflightpower.com

[This message has been edited by sf_247 (edited 05-25-2001).]
Old May 25, 2001, 07:14 PM
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Here are the results for 35 amps. I ran a 180 second test at 35 amps for each pack. The packs were peak charged on an AstroFlight 112D at 3.6 amps. All I can do is post the data. This is very interesting.
RALPH- Interesting how you got such different results. Were the RC2400 cells you used "zapped" or "matched" ?

<img src="http://www.eflightpower.com/media/tests/cp_rc_35.gif" width="515" height="517">

Shawn
Eflightpower.com



[This message has been edited by sf_247 (edited 05-25-2001).]
Old May 25, 2001, 08:33 PM
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Where does it all end?
What type of equipment are you guys using to do these tests, and what type of software, and URL's? Thanks
Jeff
Old May 25, 2001, 09:23 PM
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Jeff-
The discharger I am using is a battery dump made from a bunch of auto light bulbs. One is a 10 amp, and the larger I borrowed from a local RC car shop. I took a test to get the amp draw, and the numbers seem to confirm it is about 25 amps. In parallel, the add up to 35 amps.
I am using a quality multimeter with an RS232 serial output hooked up to a laptop that takes one voltage readings every second.
That data is imported into an excel spreadsheet and graphed. The graph is what you see.
Fun stuff.

Shawn
Eflightpower.com
Old May 25, 2001, 09:32 PM
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Where does it all end?
Thanks Shawn, I have a rs232 Multimeter, Craftsman, When you coming up to Waco to do some e-flying?
Jeff
Old May 25, 2001, 09:43 PM
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Soon, Jeff.
I got the Twinstar finished last week and have been having a blast with it. I have been looking at that Ripmax/Scorpio Spitfire that Hobby Lobby has for a next plane. Not that the Twinstar is boring, I couldn't be happier with it. But it is what it is, and I am feeling the need for something a little more advanced. About 8 flights and no crashes so far. I must be doing something wrong!
I know that there is some shareware out there for RS232 output if you do not have the software.
I am in the middle of also doing Sanyo 1600 NIMH VS. 600AE discharge at 10 amps. You should see the kitchen counter. The "misses" ain't pleased.
Take care.

Shawn
Eflightpwoer.com
Old May 25, 2001, 10:18 PM
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We are matching these after a zap and we are seeing the following at 20 amps: Turbo Matcher 4

CP2400SCR
410-430 runtime
1.120-1.140 Average Voltage
IR 30+

R/C 2400's
420+
1.130-1.170
IR <28

Overall the R/C is a better cell but the CP will cost less.

Steve
http://sjslhill.hypermart.net


[This message has been edited by sjslhill (edited 05-25-2001).]
Old May 25, 2001, 10:28 PM
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These graphs can be misleading, we have Sanyo 3000 NIMH cells at over 500 seconds at 20 amps. Different date codes produce different numbers.


Quote:
Originally posted by Ralph Weaver:
Here's 20A. At 20A, the RC2400 is 4.4mOhm, the CP-2400SCR is 5.3mOhm. This difference will show up more at higher currents.

I've got 35A done, I'll post it tonight.

See complete data at www.magtechinc.net/Cells.htm

Old May 25, 2001, 10:39 PM
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Hmm. All I know is that these are the numbers I am getting from a major cell supplier that we use. They just came in as soon as the supplier got the batch. I am suprised to say the least, maybe pleasantly suprised. I am not sure what to think. Especially since RALPH has such different results.
RALPH - What date codes do you have? Your CP are not performing anywhere as well (comparitively) as the RC2400 that you have.

Shawn
Eflightpower.com
Old May 25, 2001, 10:47 PM
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Our CP's are FD on the outside and EK on the inside. EK was a great date for R/C 2400's. The test samples of CP2400's were much better but so far these are not as good. I really think that these are very close to being the same. We will need to see more cells. I have another case coming in next week, maybe it will be a different date code.

They are still good cells....it's just that R/C 2400's so far to us are better.

Quote:
Originally posted by sf_247:
Hmm. All I know is that these are the numbers I am getting from a major cell supplier that we use. They just came in as soon as the supplier got the batch. I am suprised to say the least, maybe pleasantly suprised. I am not sure what to think. Especially since RALPH has such different results.
RALPH - What date codes do you have? Your CP are not performing anywhere as well (comparitively) as the RC2400 that you have.

Shawn
Eflightpower.com
Old May 25, 2001, 11:01 PM
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need to add CP2400


[This message has been edited by sjslhill (edited 05-25-2001).]


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