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Old 12-16-2008, 01:50 PM   #31
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I will be able to test up to 50C which is good.

The standard method to test C rate is look at the capacity of the cells at full C rate discharge. Our cells have to remain at 90% of there rated capacity at a full discharge. Some manufacturers use 80% to get there C rate.

The reason why we call our new packs 40C+ is because we use 90%. Soon we will post graphs that will show our packs capacity at 40C and 45C as we should have 45C or more at 80% capacity retention. So we could have called our new packs 45C to be the first to offer it but we will continue to use 90% as this is what we have done from day one.
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Old 12-16-2008, 01:52 PM   #32
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Sounds fast
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Old 12-16-2008, 02:14 PM   #33
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Quote:
Originally Posted by Danny/SMC View Post
Wow you are pretty funny. You claim things you can't back up.

On the subject of AE Team drivers I would like to know one of them is or was using our packs instead of the AE packs ? That is in oval where power actually counts.

Anyway keep coming on these threads with your comments that you can't back up as it's pretty entertaining.



Really not claiming anything cept knowing you would be coming out with a higher C battery will soon ...

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C-On everyone knows Rick`s a expert ...
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Old 12-16-2008, 02:18 PM   #34
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What?
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Old 12-16-2008, 03:47 PM   #35
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You might have already answered this but, will the 5000mah 40c hardcase pack have the same dimensions as the present hardcase 5000 28c pack?
It looks like it is the same dimensions...
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Old 12-16-2008, 03:55 PM   #36
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The 5000/40C will be in a slightly bigger case as oour current case wasn't to the max of the ROAR rules. It will be 2.5mm longer and .5mm higher.
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Old 12-16-2008, 04:01 PM   #37
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Are these packs going to be available/legal in time for Snowbirds?
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Old 12-16-2008, 04:09 PM   #38
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Yes as they will be in the hands of the ROAR lab on Friday. So as long as they get in before the 31st were o.k..
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Old 12-16-2008, 04:53 PM   #39
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Quote:
Originally Posted by Rick Hohwart View Post
At least the Reedy 35C will have some competition - CE numbers for this pack look pretty close.
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Rick I hope you guys changed suppliers as your 20C packs were pretty bad.
Wow.
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Old 12-19-2008, 02:38 PM   #40
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Heres are some test results some may like to see on our new 5000/40C+ cells. I asked our supplier test and show me the results of the cells used in our new packs. These are 2500 cells so our new 5000 will be 2S/2P. He couldn't test the cells in parallel as he doesn't have equipment that will allow him to test at 200 amps. He tells me that the results would be very similar using 2 cells in paralell.

We also sent him our competitors 40C/5000 pack so we can see what they are offering. I already have results from the GFX but I wanted to see what the cells were like at 40C.

I must say the cells they use are good but I was a bit surprised by the results as they claim there cells stayed at 90% at full C rate discharge and we see that they are at 84%. Our cells stayed at 91% and 90% is the standard we use to get our C rate. Many manufacturers use 80% so we will have them test our cells at 45C and possibly 50C to try and determine the C rate at 80%.
Attached Thumbnails
SMC 40C+  C-Max 7.4V Hardcase Lipos-comp40test.jpg   SMC 40C+  C-Max 7.4V Hardcase Lipos-smc40ctest.jpg  
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Old 12-19-2008, 03:49 PM   #41
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Just noticed the last part of the data is missing on both jpegs. This must of happened when converting the data into a jpeg. I will try and get this fixed.
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Old 12-19-2008, 04:03 PM   #42
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Here is the complete data in a word document.
Attached Files
File Type: doc comp40data.doc (80.5 KB, 342 views)
File Type: doc smc40data.doc (90.0 KB, 170 views)
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Old 12-19-2008, 05:13 PM   #43
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Here is a graph I created using the data of both cells.
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SMC 40C+  C-Max 7.4V Hardcase Lipos-40c-graph.jpg  
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Old 12-19-2008, 05:18 PM   #44
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For my education only, the cells are rated at 3.7 volts so 90% of that is roughly 3.33 volts. So when your cells drop below the 90% mark is where you are rating the capacity? Is that a correct statement?
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Old 12-19-2008, 05:24 PM   #45
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Capacity is determined by discharging the cells down at 1C.

C rate is determined by the amount of capacity the cell retains at full C rate discharge. Some manufacturers use 90% and others use 80%. This is why we call our new packs 40C+ as they will be 40C at 90% and higher at 80%. Will have the 80% numbers next week.
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