Xtreme2008

iTrader: (1)

Dear ROAR...would you please step in and decide which method is best for determining C rating on lipos...I've been reading the CORE5000 threads from Shawn Palmer, and those SMC and Orion, and they all have different explanations and ways to determine C rating on the Lipos we buy. Can you all just get together and decide on one method/standard and make it standerd for all manufacturers to follow, so we all have more accurate information and know what we are buying. Is so confusing with all this 15, 16, 20, 22, 25, 28C ratings, and each has his own version and way to determine, and in the end we are confused. This has to stop. Please help us

jeffb

iTrader: (10)

I'm not sure this is a ROAR issue....... But someone needs to find a standard for the rest to follow.

Just keep in mind not every company uses the same cell matching techniques with nicad or nimh either.

Xtreme2008

iTrader: (1)

Maybe. But ROAR should regulate this and manufacturers will follow the method. Their equipment can follow the standart set by ROAR, which ever it is. ROAR aproves lipos according to their set standards, and manufacturers have to adjust and make them ROAR legal to be able to participate in their events. In ROAR sets limit of 5000mah, but a certain company makes theirs 5500mah, but advertizes as only 5000mah, and their afiliated with ROAR, it looks bad on ROAR as well- false advertizing/fraud.

If I use DAnny/SMC "C" rating method, I will not get same "C" rating results Shawn Palmer claims for his CORE5000 packs and vice versa. This is not right!!!
C

TimPotter

iTrader: (15)

This is no different then the issues that racers had between Lavco and CE matching numbers. The market will bear the best methods, and create some kind of standard.

This really is not in ROAR's scope.

crazyjr

I agree, there have been problems before, with other types of batteries and they were standardized by the buying public

Xtreme2008

iTrader: (1)

True, however, it doesnt mean that it was good. If ROAR steps in and controls this now, we dont have to go thru the problems in nimh dinosaur age.

Will it make the hobby and lipo use in general better? Defenitely!!! So why not. I'm sure Danny/SMC and Mr. Palmer and the Orion and trakpower people can sit down and talk about this come up with a solution

Rick Hohwart

This is not a ROAR issue.

If the manufacturers want to get together and standardize their testing, it is up to them to do so.

Wild Cherry

You can`t base your buying decisions for Lipo base on C-rating ...

You can feel the differents between a 20c & 25c..
Its not much but it is noticable ..


However , myself would have a tuff time to notice the difference between a 25c & 27C for instance....

So things like a hard case for protection , capacity and the price would be more important in choosing a Lipo for you....

or8ital

iTrader: (38)

It doesnt really matter the rating of the cells because eventually (soon) everything will shake out and people will know which cells perform best on the track. Then we will all rush out and buy those regardless of what # is in front of the C.

ASM

iTrader: (30)

It's also my understanding that not all printed "c" numbers are really testing out to be what they say they are......

Be wise in your choices.

Xtreme2008

iTrader: (1)

Exactly!! For example, if I use Danny/SMC C rating method, and I buy Core5000 pack, according to Danny/SMC C rating defenition, the Core pack will not be the 20C claimed by Shawn Palmer/Schumacher USA. Or if I buy SMC 28C lipo, but figure out its C rating according to Shawn Palmer's defenition, then the SMC pack will be lower than 28C. SO who is tellin the truth? How can we know what we buy? The only way is for all to decided one sole method to have euqal measureing methods!

stikman

I don't think ROAR can do anything, C rating are just for Marketting only. And I don't think ROAR can tell each company/manufacture how to market their products!

teabag

iTrader: (3)

did roar control how NIMH battery numbers are determined? some companys discharge to a lower voltage then others, also some discharged at different rates: some dischaged at 20amps, some 30amps and some 35amps. don't think this is a roar issue.

hobbipro

iTrader: (23)

In the total scope of everything RC, Just how many Amps do you require from your packs? I thought mod motors pull in the neighbor hood of 30 amps or so? Even the orion 4800 15C pack will pull 72 amps with a burst of 150. Are you sure your not getting C ratings confused with IR? I really dont see how anyone can feel a differance in C ratings, most packs are going to be able to supply atleast 2x-3x the power requirements you will ever use.

Danny/SMC

iTrader: (2)

Xtreme2008: I have never mentioned that the Core packs would not be 20C based on the industry standard to test Lipos C rate. I'm pretty sure they would be 20C. Our 28C packs are true 28C packs based on the industry standard. We have posted the graphs on our Lipo thread.

I really don't see what ROAR would have to do with this and I don't think they would want to invest in the equipment to test C rate as it's very expensive to get accurate equipment that can load a cell in the 140+ amp range.

Since SMC, REEDY , Core , Maxamps , Checkpoint , Orion and others are only buying packs and reselling them we have nothing to do with C rate. We use the C rate that is provided to us by the manufacturer.

SMC decided to cycle all packs on the T35GFX so we show the consumer what he's getting and this also allows us to see if any packs are faulty or not up to standards. This is an extra step to costs money but we feel it's the way it should be done. All our competitors have access to the T35GFX and can do the same as what we do.