MaxAmps Race Edition Lipos

[gixxer]

I just want to see graphs. If MA came up with a pack that can pull a true 150c (I highly doubt it) I will be a MA customer again. Until then my money will be going elsewhere.

[JoFreak]

Not really interested in the "lipo-wars" here, but one question remains to all the people who demand to see some graphs:
What does a graph really tell you?
In case of doubt only that someone was quite capable of using power point, photo shop or MS paint and has a good imagination.
In my opinion graphs are meritless if provided by the manufacturer of the product.
Any manufacturer of any of their products that is.
I think a neutral, unbiased tester is the only one to provide a usefull graph.

But then, how do you test a product if it fullfills it's specs, if no sufficient specs are provided?
150C is fine, but for how long? One nano second? 10 seconds burst? Constant discharge? "True" just isn't a concept of time known to me.
Since there are no limiting factors given, to the amount of time the 150C are possible, one would have to assume it is constant discharge.
So maxamps-guys, if you really have any interest in "clearing your name" with the submonsters here, provide some specs so someone can actually test your products.
If not, the fronts will remain as they are.

[reno911]

Unfortunately I think the greatest form of testing would be that of the few forms of media we have. If the RC magazines that are in existence weren't so heavily dependent on the advertisement of certain manufacturers to hold a test all in one of there mags I would be a happy man.

Just imagine how many folks would be resourcing that edition for there facts on batteries. Of coarse there would be some rebuttal but ultimately they have the torch in there hands. So many of us have prescribed to at least one if not more of these magazines. Imagine if they were to be the bearer of bad news.

Unfortunately certain mags, at least the ones I read, are owned by those who control there pocket books so we will never have a magazine that can man up and show its readers a true test. Maybe one day we will have this such thing happen...

[molak]

Even if this pack do hold a 150 c discharge...(almost impossible)

WHAT´S THE POINT ??

There´s no motor/ESC that will pull that much Amps on 4s ... Is like killing a cockroach with a V2 missile...

[E-Revonut]

Originally Posted by molak

Even if this pack do hold a 150 c discharge...(almost impossible)

WHAT´S THE POINT ??

There´s no motor/ESC that will pull that much Amps on 4s ... Is like killing a cockroach with a V2 missile...

I disagree. The point of a higher C rated battery is that as your current climbs you put more stress on a battery, diminishing it's life cycle. A battery that can handle a very high discharge will not be stressed nearly as much when pulling 150-200 amp spikes if it can handle 900amp spikes. My RC8T truggy on 5s geared for less than 40 had a peak of 167 Amps. Even with good quality cells that I was using (RC-Monster 25/50C) they did get warmer than I would have liked, even though they held about 3.4V/ cell under that load, the heat that they generated did tell me they where getting stressed. If that battery had been a 50/100C it may have been 10-15 degrees cooler because I wouldn't have been stressing it as much.

I doubt that these lipos from MA are 150C constant, that may be their burst C rating, so maybe they are actually a 40C continuous, which would still be a great battery.

As it's already been stated we really need an industry standard for measuring C ratings. Such as it needs to hold 3.4 volts at load or 3.5 or whatever, as long as it's a standardized value we would really be able to make an accurate assesment on the batteries we purchase

[JoFreak]

The bigger problem would be the equipment to test those specs.
You would really need some tough hardware for those 975 amps.
I would know just the right person to do a trust worthy test:
Gerd Giese from www.elektromodellflug.de/ is the LiPo guru in Germany, he certanly would have the knowledge to test those packs, but I doubt he would have the equipment.
Even if maxamps wouldn't provide a lipo, getting one for him would be easy, if everyone here, who wants to see hard facts and definite proof, would donate 10 bucks we could easily get at least one pack.

@molak: killing cockroaches with V2 missiles?
Sounds like fun

[redshift]

^ Blah blah facts..... blah blah math....why so negative???

[sikeston34m]

Originally Posted by redshift

^ Blah blah facts..... blah blah math....why so negative???

All the Blah blah facts and comparisons point toward something........

A "True 150C" continuous rating is NOT possible from these "little" Lipo packs and these little wires.

[redshift]

I think you know that was sarcasm...

150C

[slimthelineman]

whats sarcasm? ha ha sorry red couldnt help it! at the risk of stirring up another sh!tstorm i want to throw a question out there. thought of something interesting today during a conversation with a buddy. now i know these are dc batteries, but we subject them to high frequency switched loads right? seems logical to me but everything sounds good inside your own head i gues..... so my question is, to which does the "C" rating refer to? a dc constant load or an ac like switched load? i could see a battery sustaining a higher switched load than a constant one. feel free to blow this out of the water if im wrong, but i think it might be something to consider if we are tying to pioneer a standardized rating system, and since our esc's are all high frequency switches in a sense maybe this is how we should rate these packs? no? i mean lets face it we all know that even a peice of 8 gauge wire wont take more than a couple hundred amps of straight/constant/dc load without becoming a fusable link(fun to watch!) right? but go to a switched/ac load and it might hold a bit more load. any who just curious to hear what others think on the topic. LET THE STORM BEGIN! ha ha ha....

[_paralyzed_]

it's dc, needs to be tested as dc, and at no point in time becomes ac.

I get what you're saying though. Your theory might work if we tested after the esc and before the motor, but simply testing the battery all we need is dc.

[JERRY2KONE]

Sikeston just reading through your post boggles the mind. Not working with this kind of high end electronics equation stuff leaves one speachless. Still I get what your saying pretty well, and that is exactly what I was thinking before reading your post. Having an R/C type of LiPo battery that can deliver 150C discharge just seems impossible to me. More like scinence fiction than reality. You have to wonder where in the world are the MaxAmps people are getting this idea of 150C from. Well I would like to hear their side of this explanation. So we know your reading through all of this. Lets here it Maxamps. How are you calculating a 150c draw from a 4.2volt cell? I am not getting it????

[slimthelineman]

Originally Posted by _paralyzed_

it's dc, needs to be tested as dc, and at no point in time becomes ac.

I get what you're saying though. Your theory might work if we tested after the esc and before the motor, but simply testing the battery all we need is dc.

rodger that! makes more sense when i see grover explaining things you guys are right, for some reason ive been preprogramed working with ac for so long i forget that it has a brother, dc who is much happier to do what you tell it to. what really throws me are the three phase wires on the motors, i see that and boom my brain sweats cause i think i got some ac excitement!

[What's_nitro?]

Not to burst your bubble, but there is no AC current at the battery terminals... I think you meant to say Pulsed-DC current. I know what you're getting at, though. The C rating would refer to a constant load, rather than a pulsed load. Seeing as how our ESCs use such high frequencies, they can be taken as a constant load.

[bruce750i]

If you invented the bread slicer, wouldn't you have a slice of bread to show off?