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Old Jun 26, 2001, 04:24 PM
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Joel K. Scholz's Avatar
Kingsland, Texas USA
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How good are the R-C 2400, N-2400SCR batteries

I just received a new Max products catalogue and they are offering 2 new cells I am not familiar with. The RC-2400 and N- 2400SCR. They actually weight a gram less than the 1900's I'm using. I wouldn't mind a bit more endurence for my new seaplane. Can anyone tell me about them?
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Old Jun 26, 2001, 04:37 PM
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Austin, Texas USA
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The RC2400 cells have been around for a while. They are a standard sub-c size, and weigh 2.09 ounces each. The Sanyo N-1900SCR weigh in at 1.96 oucnes each, according to Sanyo specs.
Anyway, the RC2400 were co-developed by Trinity, the car motor people. In return, Trinity has the exclusive distribution rights to the cell, which explains the ridiculously high cost.
One of Sanyo's largest customers is the cordless tool market, and they can not afford to spend that kind of money on cells. So, Sanyo came out with the new CP-2400SCR cell. This cell has nearly the same performance as the RC2400 for a much cheaper price. The RC2400 is still a competition grade cell. Both test at about 2700-2800 mah actual capacity.
At currents under 30 amps, you will be hard pressed to find a difference in performance between the CP2400 and RC2400 cells. At currents over 35 amps, the RC2400 will give better performance due to a slightly lower internal resistance.
For most of our uses, 30 amps is sufficient, so the CP2400 cells are a better buy. For high current applications, the RC2400 may be the better choice.
For comparison, our 8 cell CP2400SCR packs are $40, while the RC2400 packs are $52.
And if you need 7 cell packs, we have those on sale right now - $34 for CP2400 and $44 for RC2400.

Shawn
<a href=http://www.eflightpower.com>Eflightpower.com</a>
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Old Jun 26, 2001, 04:47 PM
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> The RC2400 is still a competition grade cell. Both test at about 2700-2800 mah actual capacity.

I disagree. In my experience even the best RC2400 cells give out less than 2400mah. I have two competition matched/zaped packs that give out 2.24ah. I have never heard people say they get more than 2.4ah out of RC2400 cells.

Neil.
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Old Jun 26, 2001, 05:39 PM
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I think the marketing department is working over time to keep the price of the RC2400s up in light of the CP2400 cells. In fact the only difference that Sanyo says is that the CP2400 cells have a wider range of capacitiy--a greater spread between the highest capacity and lowest. The resistance is the same as is the cell weight. My advice is that the CP2400s will work in all applications--and they can be zapped and matched also.

Steve
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Old Jun 26, 2001, 05:51 PM
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Neil, you sure you don't have an early batch of the RC-2400's? Those batches were plaqued with lower capacity than they promised, while later batches were much better. At least that's what has been said by several battery companies when I have spoken to them over the phone.

Ed
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Old Jun 26, 2001, 10:06 PM
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Austin, Texas USA
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Quote:
Originally posted by Neil Stainton:
> The RC2400 is still a competition grade cell. Both test at about 2700-2800 mah actual capacity.

I disagree. In my experience even the best RC2400 cells give out less than 2400mah.
Neil.
The newer cells test around 2800 mah under low currents. I can not speak for the older ones. Of course, at a 50 amp discharge, they will not do a 2800 mah test. But I routinely get much more than 2400 out of them, no problem.

Shawn
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Old Jun 27, 2001, 12:57 AM
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Gentleman thank you for you informed replys.Joel
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Old Jun 27, 2001, 07:55 AM
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All of my 2400's give much more in low current capacity tests. At 90A, I get substantially less, however..
..a
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Old Jun 30, 2001, 08:02 AM
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Ralph Weaver's Avatar
Indianapolis, IN USA
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In my 20A tests, RC2400's did about 2350mah and CP2400's did about 2270mah. All cell were purchased in March of 2001.
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Old Jun 30, 2001, 01:36 PM
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Between Goodtill and I we have over a 100 of the cp 2400's. We haven't noticed much of a performance drop in them.

Now that we have the Evil Dr.'s seal of approval we'll probably buy more of them!!!
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Old Jul 01, 2001, 06:05 AM
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Hatboro Pa. USA
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Go to ebay today 7-1-01. You only have 13 hours left to get some of the Sanyo CP-2400s for 3.00 each. I have delt with these people many time in the past. They have a great product. I just ordered 16 myself. Be sure to see his other auctions and his site.Just search tnrbattery as the selled or Sanyo as the item. He has 250 for sale but they are going fast.
Capt. Dave
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Old Jul 01, 2001, 07:11 AM
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> The newer cells test around 2800 mah under low currents.

I find that very hard to believe. If so why don't Sanyo re-brand them RC2800? I would realy appreciate it if you could send a pack to S&E Modeler so that they can be tested authoritively by Steve Neue.

> I can not speak for the older ones. Of course, at a 50 amp discharge, they will not do a 2800 mah test.

My competition matched/zapped pack, purchased Feb 2001, give out 2.24 when tested using my Schulze's auto discharge function, at about 1.4A.

Neil.
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Old Jul 01, 2001, 07:16 AM
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> Neil, you sure you don't have an early batch of the RC-2400's?

Mine were purchased from Anthony Brindle in Feb 2001. He supplies cells to UK competition fliers. I don't think my cells are in the top 10%, but I am sure they are above average.

> Those batches were plaqued with lower capacity than they promised, while later batches were much better. At least that's what has been said by several battery companies when I have spoken to them over the phone.

Of course that would be a good marketting ploy to get you to buy some new "better" ones. Have you heard any independent authorities say that?

Neil.



[This message has been edited by Neil Stainton (edited 07-01-2001).]
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Old Jul 01, 2001, 10:02 AM
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Neil, the independant tests by fellow Ezoners are the only feedback I have had outside of my own experiences and the two dealers I have spoken with.

There was a thread with test data someone published showing upwards of 2700mah. I can't find it now. I suppose the reson the companies don't sell them as RC-2700's is because of the quality control issues. Especially if you are getting lower readings yourself on a consistant basis.

I run matched RC-2400's 16 at a time and they have performed excellently at 50 amps. They were late 2000 production ones, earlier than yours, but that's assuming you didn't get "shelved" batteries thet were from early on.

Your suspicions about the range of capacities out there are obviously founded as demonstrated by your cells. I guess I got lucky - mine appear to be better than average.

Ed
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Old Jul 03, 2001, 10:27 AM
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I agree with Neil, my own packs of 10 x 2400s show just under 2400 ma on discharge even at three amps to 1 v per cell - even a matched and zapped pack. At much higher currents (70A +) they drop to around 2100 ma.

Allways manage to get over 2400ma into them though!

I'm Flying
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