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› Questions on C rating
08-08-2012 05:46 PM  5 years agoPost 1
HeliNutAndy

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worcester, MA USA

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Hello,

I am still a bit confused regarding the C rating on Lipo batteries. As I understand it the C rating is how much juice can flow in and out of the battery. When purchasing a battery why would I need a higher C rating? Is it really needed(a higher rating)?

TIA

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08-08-2012 06:45 PM  5 years agoPost 2
Heli 770

rrProfessor

USA.

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Two "C" ratings, one for charge rate and the other for discharge rate. To find Max. discharge rate, capacity x discharge rate. Higher rate will depend on you Heli and what you have now.

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08-08-2012 06:51 PM  5 years agoPost 3
HeliNutAndy

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worcester, MA USA

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I have a Trex 550. I know a higher C rating means more $$$. I don't mind spending the extra money but if it's required.....

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08-08-2012 06:53 PM  5 years agoPost 4
eddiscus

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Dumont, NJ-USA

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This is all based on supposed accuracy of the battery manufactures advertised data.
But the c rating of a battery is the advertised maximum current it is capable of supplying for a short burst. For example a 5000ma battery rated 45C should be capable of 225 amps (5000ma*45) and a 5000ma battery at 65C should be capable of 325amps.

Why bother?
Well if you are building a heli and you know your motors rating. Knowing it draws a peak current of up to 300amps. Then you would be better off with the 65C rated battery as it will be less of a limiting factor to current flow then the 45C pack. You also need to take into consideration your ESC, connector and wire size choices as well.

Logo Xxtreme 800
Logo 700
Citizen 142
Synergy 766
TDR 2

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08-08-2012 06:57 PM  5 years agoPost 5
adamsz06

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Geilenkirchen Germany

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You do need the higher c rating if your motor is capable of pulling the higher amps. If you have a high amp draw motor and marginal battery c rating, you'll end up with puffy ruined lipos in short order...

R.I.P. Roman

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08-08-2012 07:04 PM  5 years agoPost 6
HeliNutAndy

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worcester, MA USA

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Is there some type of calculator out there that will provide this information? I know what kind of heli I purchased and can check the motor but what about the other variables in the chain like the speed controller?

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08-08-2012 07:08 PM  5 years agoPost 7
adamsz06

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Geilenkirchen Germany

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Should be on the spec sheet for the esc. Look for the maximum burst amperage and for how long.

R.I.P. Roman

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08-08-2012 07:43 PM  5 years agoPost 8
BarracudaHockey

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Jacksonville FL

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Note that some manufacturers C ratings are more .... lets say.... optimistic than others so check around to see whats working for other folks.

Its one thing to print 65C on a sticker, its another to make a battery that will deliver that without puffing.

Andy
AMA 77227
http://www.jaxrc.com

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08-11-2012 04:20 PM  5 years agoPost 9
HeliNutAndy

rrKey Veteran

worcester, MA USA

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My esc is this one

http://www.alignrcusa.com/index.php...roducts_id=1853

And my motor is this

http://www.espritmodel.com/hml60m02...0mx-1220kv.aspx

Could you please let know what I would need for a c rating?

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08-11-2012 04:35 PM  5 years agoPost 10
TheWoodCrafter

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Costa Mesa, Ca.

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Most of the time guys really don't use what a high discharge C battery can give.
There is a guy at our field that is every bit as good as just about about any pro you have seen and he only uses 25C packs.

So I don't spend any more than I have to for batteries, I usually only buy 25C or 30C packs.

And if you are not a really hard 3D flier, you will be waisting your money on higher C rated packs.

Thanks, TheWoodCrafter

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08-11-2012 04:37 PM  5 years agoPost 11
Heli 770

rrProfessor

USA.

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The motor is rated Max. 90A continuous. You might consider on getting a higher rating ESC.

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08-11-2012 04:48 PM  5 years agoPost 12
HeliNutAndy

rrKey Veteran

worcester, MA USA

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The motor is rated Max. 90A continuous. You might consider on getting a higher rating ESC.
Those items came with the Trex550E combo kit. This is my first larger heli and I think those items should be fine.

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08-11-2012 05:25 PM  5 years agoPost 13
adamsz06

rrVeteran

Geilenkirchen Germany

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Edit...pm sent

R.I.P. Roman

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08-11-2012 05:29 PM  5 years agoPost 14
HeliNutAndy

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worcester, MA USA

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I am fairly new to the sport and I spend my time hovering, circles, flying forward, etc no 3D.

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08-13-2012 02:47 AM  5 years agoPost 15
TheWoodCrafter

rrKey Veteran

Costa Mesa, Ca.

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am fairly new to the sport and I spend my time hovering, circles, flying forward, etc no 3D.
There you go!!!

Buy 20C - 25C packs, you will never know the difference.
Save your money for crash parts.

Thanks, TheWoodCrafter

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08-13-2012 04:29 PM  5 years agoPost 16
Richardmid1

rrProfessor

Leeds, England

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Buy 20C - 25C packs, you will never know the difference.
Save your money for crash parts.
+1

Really annoys me when people say you need 45C+ packs based purely on what the motors current rating!

JUST BECAUSE A MOTOR IS RATED AT X AMOUNT OF AMPS DOESN'T MEAN THAT IS WHAT IT WILL PULL IN YOUR HELI!!!!!!

CHOOSE YOUR BATTERIES C RATING (IF YOU CHOOSE TO BELIEVE THEM) BY HOW YOU ARE FLYING THEM, this can be done by what flight times you get out of your heli. The shorter the flight time the higher C rating you may need.

As a general rule:

4.5mins+ - 20C
4-4.5 mins - 25C
3.5-4 mins - 30C
3-3.5 mins - 40C

60% of the time, it works every time!

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