flymetonight

You have seen many of these 80c 100c 120c rated Lipos.
They are all Fake numbers !!!

The best Modern Lipos has about 35c to 40c in Real C Rates today.

Looks like TRX actually may have real C Rates in their Lipos.
Anyways i dont buy any TRX Lipos ever. Overpriced. Bad Connectors, and to be Honest, i dont like the way they do business in many ways.

Anyways, if you want a okey Lipo, Look anyways after the big C numbers, the 80c-120c lipos are most like the good real 30-40c
Many 50c lipos can be as low like 15-20c in real rates.

I wish they told the real numbers, why do they lie ? and make fake labels with 2x or 3x bigger numbers ?

Andy Koback

iTrader: (280)

A selling point.

STLNLST

iTrader: (32)

Its all marketing. When Lipos first hit the rc scene we all had the Kokam 20C lipos from Orion then SMC introduced their red case 28C lipos then from there the madness started.

gigaplex

iTrader: (2)

Pretty much manufacturers trying to one-up the competitors each time, and it got out of hand. They can't really release a true 50C anymore as it'll sound worse than their current "150C" packs.

Roelof

A subject talked in many topics about batteries and C-ratings. Search for them!

But the high C-ratings are no continuous currents but burst peak. Easy to lie about because no one will be able to test them.

flymetonight

My latest 6600mah Lipos are rated 120c continuous and 240c Burst LOL
Anyways these are great Lipos. Many Speedrunners use them and they run 150mph + easy with this Brand. CNHL .

Here we have some 200c



Sad they do False Marketing.

Here you have another fun False Marketing

15" CAR SUBWOOFER they claim 4200w, look at that little magnet. You are lucky if you can have REAL 800-1000w from this



And down you have the real deal, 15" Subwoofer that actually can handle real 4000w atleast , Very big magnet, high quality, expensive real stuff



This one weight also about 10x more than the first one, both are 15inch

Roelof

Yeah, it is called PMPO power, there is a lot to find on the web. The idea is the same, the speaker can withstand a short burst of a high peak power.

Regarding the batteries, it is not unthinkable. The theoretic maximum current is a shortcut of the cell where the cell its internal resistance is limiting the current.
200C on a 1300mAh battery is just 260A with the voltage of one cell (4.2v) and the ohms law formula I come to an internal resistance of 15 mOhm......

Bsthetech

iTrader: (17)

Welcome to Earth.

flymetonight

Im at Earth for shure

Some manufacturers maybe believe they are out in Outer Space

Roelof

more than 90% of the drivers in this world, even from the top level racers, have no clue about the tech side. They are like you no mechanical nor electrical engineers so they do not have to be in outer space.

There is a topic about the c-rating where an technician explains and calculate the true max currents. Do some searching....

billdelong

iTrader: (33)

Technically they are not lying... problem is that there is no industry standard for what the C rating is. Most will probably argue that C is short for "Continuous" meaning that battery can handle the rated load for a continuous amount of time... HOWEVER what many brands are doing in order to inflate their C rating is by reducing the length of time for the alleged "Continuous Load" which is effectively a "Burst" rating. Many years ago you would see both Continuous and Burst ratings on almost every brand of battery. Slowly over the years they would highlight the "Burst Rating" in bold and eventually what you see today is just the "Burst Rating" as the only C rating provided. You will need to dig into the battery specs or simply ask the battery dealer what their definition of C rating is... I've seen this range anywhere from 10 seconds to a minute where the 10 second rating are those with extremely inflated C ratings.


In the mean time, there is a guy here asking for people to donate various brands of batteries to compare performance to get apples to apples comparison for C Ratings, scroll down to post#17 to see the first comparison chart with apples to apples:

https://www.rctalk.com/forum/threads...mh-aas.136829/

Roelof

To come back to this (may you not put me on your ignore list) 15mOhm seems like a normal number for such small cells. On the other hand normal size batteries with even lower than 100C specs do report 3 mOhm average and people here do talk about 1 mOhm.
Internal resistance will give a voltage loss. Lets say you draw 150A, with the 200C battery you will have 2.25v loss, with a normal pack with 3mOhm it is 0.45v and with 1 mOhm you will have "just" 0.15v (per cell !!!!)

So what pack is better? the 1300mAh-200C or lets say a 8000mAh-100C ?

Based on the theory that the C-rating is based on the max shortcut current by the internal resistor. Then the 8000mAh-100C pack can draw 800A max and with a 4.2v cell you come to an internal resistance of about 5 mOhm and will the voltage loss@150A be about 0.75v per cell, still much better than with the theoretical calculated 1300mAh-200 battery.

So people are fooled with that small battery or the internal resistance is much better than to expect. Although weight plays a role with dragracing. with speedruns not that much.

gigaplex

iTrader: (2)

I'd go so far as to call it actual lying. No way is my 10,000mAh 130C pack going to supply 1300A even if it's just a burst.

RC10Nick

iTrader: (9)

This is the real problem.

When you buy any electrical component it has to go through certification lab testing where there are strictly defined tests with strictly define test conditions that dictate how that product can be rated. And when you buy those components they come with a mark of conformity from the testing lab along with a list of the construction/testing standards those components conform to. That way if you buy a 20A circuit breaker from Eaton and later on replace it with a 20A circuit breaker from ABB, you know they've been tested and certified to the same standards and they will both perform exactly the same in whatever application you're putting them into.

gigaplex

iTrader: (2)

Correction: that only applies to mains powered electrical components.