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Old Oct 11, 2009, 10:12 AM
Southern Pride
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Haralson County GA. USA
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EM 25 3s 3300 / EM 30 3S 3200

Here I go again. Sometimes it seems like I just test LiPolys .

Vendor's info here

http://www.rcgroups.com/forums/showp...37&postcount=1

Background info, months ago I was contacted by Dean with a request for testing guidelines. It appears that he indeed was able to locate some rather good cells / packs. I always prefer to wait until a battery has been tested over times / cycles to form a real opinion as first impressions can sometimes be deceiving however my test setup is hard to fool.

Added: Do not charge more than 2c rate (2x capacity) is clearly printed on the lable. Be that as ist may the first charge was at 2C and all others (2-7) have been at 3C and if I go higher I will try to remember to so note. IMO with IR as low as these are 5c should not be a problem but then you pay your money and treat them as you may..

12-12-09 Dsc graph 4-40 added

12-13-09 Ds graph 4-50 added

See post # 9 for 30C 3200

Charles
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Old Oct 11, 2009, 10:41 AM
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The IR was 1.6 for all three cells...WOW
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Old Oct 11, 2009, 10:58 AM
Southern Pride
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The IR for each cell was 1.6. Cell Pro 10 measures IR of each cell seperately buy means of a Kelvin connection.

While some other chargers measure IR some only measure the whole battery which includes leads and connectors and some that measure cells do so rather poorly in my opinion. One of my other chargers gave IR of 2.0 / 2.0 / 0 which is not very accurate IMO.

Charles
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Old Oct 12, 2009, 11:55 AM
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Quote:
Originally Posted by mvortex
The IR was 1.6 for all three cells...WOW
In the cell matching process we actually check the cells capacity/density 3 seperate times and then group them accordingly for the packs.

So for $60 you can get an EM25 3S 3300 25c and thats including a 50% crash policy, I hope people start to understand that this a wiser solution and alternative than to use the cheaper Chinese packs that have no support to the customer at all.

We really are trying our hardest to provide the best to our customers
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Old Oct 12, 2009, 02:21 PM
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Hey Guys! anyone interested in batteries we are offering a discount code EM4OFF that will give you an extra 4% off EM line of batteries. Please check out EspritModel.com or your local hobby shop for purchasing.

Thank you!
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Old Oct 12, 2009, 05:16 PM
Southern Pride
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Graph for dsc#4-40 @ 40 amps. added to post #1

Charles
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Old Oct 12, 2009, 11:33 PM
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That 1.6 IR looks really good when I see other really good cells around 2.5 IR.
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Old Oct 13, 2009, 08:26 AM
Southern Pride
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Just be careful comparing IRs . Remember device used to measure IRs,temp, state of charge, capacity of cells,etc. can and will give different readings.



Yes for these cells 1.6 is very good however I have checked other same capacity C rated cells with IRs of 2.0 - 1.8 - 1.9 at cycle 135 after another with cells at 1.9 - 1.8 - 1.9 after 136 cycles and yet another with 1.6 / 1.6 / 1.6 after 87 cycles with most charges at 5C.
Charles
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Old Oct 18, 2009, 03:29 PM
Southern Pride
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EM 30 3S 3200 @ 40 amps. D#4-50

Cycles 4-50 @ 40 amps.

Discharges @ 10-80 amps. for this one is here

http://www.rcgroups.com/forums/showp...6&postcount=42

Charles
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Old Dec 10, 2009, 01:53 PM
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EM 25 3s 3300 ?

That's a very odd mah to test Charles, why not the super common 2200 mah packs that you usually test?

I'll concur that it's looks more impressive, (because you can draw more current from a larger capacity pack ) , but I find it deceptive in practice myself to try and "fool" the audience.
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Old Dec 10, 2009, 02:02 PM
Southern Pride
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I rountinely test 1100 through 3300s and even a 110 from time to time. Take the capacity and divide the discharge rate to get C discharge rate.

\

http://www.rcgroups.com/forums/showp...70&postcount=4
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Old Dec 12, 2009, 07:40 PM
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Quote:
Originally Posted by everydayflyer View Post
I rountinely test 1100 through 3300s and even a 110 from time to time.]

You use the word "test" too loosely Charles.
You're not really "testing" these packs, you're simply running them up at 1/2 their advertised constant amps.

I'd like to see you actually "test" a pack ..... really run it up ...... see if it'll hit it's "burst" rating, (for even a moment), and then see if you can maintain it's advertised constant amps for at least 30 seconds.

That, Charles, would be "testing" a battery.
(I have old school packs that can run all day at 1/2 their advertised amps, big deal)


A friend and I have been actually "testing" the latest packs from 2009, and have a ton of video results
We'll be posting it all soon.
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Old Dec 13, 2009, 01:08 AM
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Quote:
You use the word "test" too loosely Charles.
You're not really "testing" these packs, you're simply running them up at 1/2 their advertised constant amps.

I'd like to see you actually "test" a pack ..... really run it up ...... see if it'll hit it's "burst" rating, (for even a moment), and then see if you can maintain it's advertised constant amps for at least 30 seconds.

That, Charles, would be "testing" a battery.
(I have old school packs that can run all day at 1/2 their advertised amps, big deal)


A friend and I have been actually "testing" the latest packs from 2009, and have a ton of video results
We'll be posting it all soon.
I rather take Charles multi-cycle test then a few on full burst, doesnt matter if the "label" is correct or not, really.
Reading charles graphs you can compare one pack against one other easy, just by checking the discharge C rate, voltage under load and where it breaks through a certain limit. That combined with IR of the pack gives me all information I need really.

So what if the Manufacturer label is "off" for a test, does it matter? unless you change the whole industry, no-one is going to bother changing it, its like Gas/Milage on the cars, its a selling point.

Real life cycle life is more important, at least for me and all that I know follow charles testing.
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Old Dec 13, 2009, 01:08 PM
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Quote:
Originally Posted by LipoMythBuster View Post
A friend and I have been actually "testing" the latest packs from 2009, and have a ton of video results
We'll be posting it all soon.
Video results of "testing"? Sounds like really scientifically controlled testing - can't wait.

Bill
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Old Dec 13, 2009, 02:51 PM
HAL... Open the damn doors!
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Quote:
Originally Posted by LipoMythBuster View Post
A friend and I have been actually "testing" the latest packs from 2009, and have a ton of video results
We'll be posting it all soon.
How about using your regular name so we know who we are dealing with? I have a hard time believing a guy with 10 posts happens to wander in and tell Charles he's "testing" wrong. Also with a name like "LipoMythBuster", I hope you bring some data we've not seen before... Quite frankly I smell something...

Jack
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