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HomeAircraftHelicopterHelicopter Main Discussion › 12S C rating importance?
09-21-2013 06:00 PM  5 years agoPost 1
McKrackin

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Lucasville,Ohio

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I mean a 5000mAh 20C pack will do 100A continuous and 150A burst.

How important is a high C rate in packs that big?

I literally never use the word literally right.

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09-21-2013 06:05 PM  5 years agoPost 2
altima1779

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Toledo, oh u.s

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Depends how hard you fly. you can use 20c if you have them but I would hazard a guess they will not hold up as well as 35c or higher packs would.

Your going to be flying at the higher limits of the discharge rate which in turn will probably make puffy, puffy packs and short life span.

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09-21-2013 06:10 PM  5 years agoPost 3
rexxigpilot

rrProfessor

Florida

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A C rating, if it is even accurate, is only valid when the pack is brand new. After a few flights the power capacity (C) drops, so after perhaps 50 flights that 20C pack has only a 10C capacity. Now you only have a 50A rating with that same 5AH pack.

Combine the natural degradation of the pack due to cycles and age with the overstated C values advertised by the manufacturers and you can see why it is important to buy a C rating much higher than what your system requires.

I only buy 40C and above anymore to avoid throwing away weak packs within a few months of purchase.

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09-21-2013 07:37 PM  5 years agoPost 4
McKrackin

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Lucasville,Ohio

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So a 40C pack is a 20C pack after 50 cycles?
This seems the complete opposite of what all the E guys have preached to me for years.lol...

It does sound exactly like what I always replied though

I literally never use the word literally right.

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09-21-2013 08:14 PM  5 years agoPost 5
altima1779

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Toledo, oh u.s

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I'm no scientist but I can't imagine the drop off of c rating would be that dramatic. I have packs that are at least 4 years old that still perform well.

I fly my packs pretty hard and I get around 3 seasons out of a set of 6s 5000mah packs. Now my flights per season may be far less than someone else but to me it is money well spent.

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09-21-2013 10:03 PM  5 years agoPost 6
qraptor

rrApprentice

Illinois

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I also find the C ratings to be part science, and part marketing. It is probably better to go higher, but above 40C may not make any difference.

A 5 Ah pack used to 80% is like having 4 Ah or 240A-min available.
If a flight lasts 4 min, then the pack has supplied 60A current on average. This translates to a 12C rating for a 5 Ah pack, on average!

Now, the peaks will of course affect these numbers, but it helps to have the basics in mind. A 150A peak is 30C for a 5 Ah pack.

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09-21-2013 11:10 PM  5 years agoPost 7
Stephen Born

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USA

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Ernie,

Are you utilizing 12s 5000mAh 20c packs for your machine?

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09-22-2013 12:55 AM  5 years agoPost 8
McKrackin

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Lucasville,Ohio

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I don't have any packs yet.

I literally never use the word literally right.

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09-22-2013 01:01 AM  5 years agoPost 9
Stephen Born

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USA

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Your electric is the 450, yes?

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09-22-2013 01:16 AM  5 years agoPost 10
McKrackin

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Lucasville,Ohio

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This is about my 700.

My 450 has 30C packs. They are cooler than ambient when I land and I have been charging them at 10A.

Two Turnigy 2200mAh 30C 3S and one stock E Flite 30C 2200mAh 3S.
They are cool after the charge as well.

I literally never use the word literally right.

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09-22-2013 01:34 AM  5 years agoPost 11
Stephen Born

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USA

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2200mAh gives a respectable flight time for a 450.

As far as your 700, you will be satisfied with a 4000mAh / 5000mAh 25c - 35c.

I usually do not recommend inferior products, but I have been using Turnigy batteries for some time with no complaints.

Great price and good batteries.

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09-22-2013 02:06 AM  5 years agoPost 12
Tyler

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Chicagoland area

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There is no standardization or industry benchmarks to establish, verify, and hold accountable true "C" ratings.

Some of the lowest rated packs are competitive with the premium brands with premium ratings.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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09-22-2013 04:04 AM  5 years agoPost 13
Dr.Ben

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Richmond, VA, USA

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Lots of smoke and mirrors here . I know of one brand of 25c pack that absolutely behaves like a pack with twice the c rating and which certainly does not go weak in any time frame remotely approaching a few months.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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09-22-2013 04:07 AM  5 years agoPost 14
3dgimble

rrKey Veteran

Rochester

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The higher C rating lipos will offer faster discharge and longer life because of lower IR's(lower internal resistance), especially under 3D use, a lower C rating pack can become heat soaked much easier than higher ones. Main things I have observed that destroy lipos fast are in order, over charge, continuous current over draw/HEAT, leaving them fully charged, even for a few days I notice that IR can rise.

ed;
I know of one brand of 25c pack that absolutely behaves like a pack with twice the c
Dr. Ben is referring to TRUE C rating which a lot of lipo manufacturers exaggerate. I will also farward Dr. Ben by adding from my own experience, I have noticed that some of the many 5000 65C pack I have had, were out lived and matched in performance to some true 35C rating packs I still have in 12S configs.

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09-22-2013 05:11 AM  5 years agoPost 15
McKrackin

rrProfessor

Lucasville,Ohio

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What brands are you guys talking about?

I literally never use the word literally right.

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09-22-2013 01:47 PM  5 years agoPost 16
rpat

rrElite Veteran

Weirton, W. Va.

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I agree with Mac...lets not fuss about brand names. None of us here are represented by battery manufacturers. ( at least I don't think that we are.)
So give us mortals the names of the batteries that you think are better.

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

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09-22-2013 01:58 PM  5 years agoPost 17
Craigdieslemac

rrKey Veteran

Valdosta, Ga USA

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I have a set of Gens Ace 5300 mah 60c that I love.. I believe I will buying at least 2 more sets of these giving me a grand total of 6 batteries. They are never hot when I land, but I leave a lot in them so they will last longer. 3.7 is my soft cutoff and that gives me around 8-9 minutes with 1850 head speed in a Goblin 700. I land usually around 5-6 minutes and there is usually around 3.8-3.9 left in the cells.. Even with a 2250 head speed. These batteries have 30+ flights on them and I expect them to last 200+ Flights.

Aut viam inveniam aut faciam

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09-22-2013 04:55 PM  5 years agoPost 18
BladeStrikes

rrElite Veteran

Shelby TWP,Mi

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Get some of these http://www.snhobbies.com/index.php?...b9c2310c0d5027b ..Thats what I used in my electrics and always got hundreds of cycles.Couldn't tell the difference between a set that was new and a set that had over 300 cycles...
Them batterys never dropped power/punch after 50 cycles...

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09-22-2013 07:21 PM  5 years agoPost 19
Heli_Splatter

rrElite Veteran

USA

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We fly four Nanotech A+ 5000mahr 65-130+C 6S batteries on Quadzilla and it has won two lifting contests.

I have had good luck with Nanotech batteries.

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09-22-2013 08:02 PM  5 years agoPost 20
McKrackin

rrProfessor

Lucasville,Ohio

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We fly four Nanotech A+ 5000mahr 65-130+C 6S batteries on Quadzilla and it has won two lifting contests.
Do you have any pix or video of that monster?
Would love to see it.

I literally never use the word literally right.

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HomeAircraftHelicopterHelicopter Main Discussion › 12S C rating importance?
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