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11-02-2013 03:17 AM  5 years agoPost 1
edwelds

rrApprentice

hartford,ky-usa

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Iam setting up a synergy 600e with 2 6cell packs. Some 30c packs are considerably cheaper and lighter than 45c packs. What C rating is best for this setup?

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11-09-2013 07:24 AM  5 years agoPost 2
olegeezer42

rrNovice

Palm Springs, CA USA

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Basically the higher the C rating the more energy the battery can deliver without causing harm and the longer it will last. Both in lifetime as well in minutes of flying.

So to use a 45C battery in place of a 30C battery is fine. The other way around is not.

A 30C battery will almost always be cheaper, since it has less energy capacity. i.e. It will not run as long as a 45C battery at the same load.

You get what you pay for.

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11-09-2013 11:42 AM  5 years agoPost 3
Retired2011

rrElite Veteran

Lee's Summit, MO

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True, but the 30c pack will also be lighter - so the flight time difference will be negligible.
As stated though, performance and longevity will be better.

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11-09-2013 11:51 AM  5 years agoPost 4
wrongler

rrProfessor

Brewerton, New York

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When I was learning to fly I used the 30c lipos because I couldn't fly long enough to warrant the higher C rated lipos. It saved me a little $$.

Bill Whittaker

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11-10-2013 02:34 AM  5 years agoPost 5
BarracudaHockey

rrMaster

Jacksonville FL

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I'm stuck on the point that a higher C battery lasts longer in flight minutes than a pack of the same capacity with a lower C rating.

Care to explain that?

A word about C ratings, some are...shall we say....optimistic, and some are down right fanciful.

About the only meaningful comparison is between C ratings from the same manufacturer, at least you know they are optimistic by the same amount.

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

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11-21-2013 06:18 PM  5 years agoPost 6
ssmith512

rrKey Veteran

Indianapolis, IN USA

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I was under the impression the C rating is the maximum discharge current the battery is able to put out. For example, a 30C, 2500mAh battery is capable of providing 75 Amps of continuous current (2.5A * 30C = 75A).

The capacity of the battery (2500mAh) dictates the "flight time". A 2500mAh battery will provide 2.5A of current for 1 hour (fully charged to fully discharged).

The C rating has nothing to do with flight times.

Steve

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11-21-2013 06:23 PM  5 years agoPost 7
JKos

rrProfessor

Redondo Beach, CA

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A 30C battery will almost always be cheaper, since it has less energy capacity...
Not true. The C rating has nothing to do with energy capacity. Absolutely nothing.
A word about C ratings, some are...shall we say....optimistic, and some are down right fanciful.
Absolutely true.

- John

RR rules!

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11-22-2013 12:07 PM  5 years agoPost 8
dahodevil

rrNovice

des allemands,LA USA

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+1 C rating has nothing to do with flight times. It is simply the maximum rate the battery can be safely discharged.

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11-22-2013 11:20 PM  5 years agoPost 9
edwelds

rrApprentice

hartford,ky-usa

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I went to Vocational school to study Industrial Electricity and basic electronics.That being said, I think a great many of these figures are very hard to belive. Such as a 3600 mah 45C battery supplying 100amps of current. Unless these are some sort of cold fusion battery packs being kept a trade secret.

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11-23-2013 12:00 AM  5 years agoPost 10
Ace Dude

rrProfessor

USA

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The best packs available today (even those rate at 60C or higher) can really only deliver about 40C tops. C ratings are crap shoot at best.

  

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11-25-2013 04:37 PM  5 years agoPost 11
S Crutchfield

rrNovice

Arkadelphia,Ar. usa

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Found this article on one of the forums
A 1C discharge rate, by definition, means that you're going to discharge your battery in an hour. 2C is half an hour, 10C is six minutes, 30C is two minutes, etc. 65C, which by this point seems to be almost a baseline in the market, means your battery will be drained in 55 seconds.

That's how I usually think about C ratings, in terms of time. Yesterday, though, I started thinking about it another way, in terms of current draw. Looked at this way, a 1C discharge rate means you're pulling amperage equal to the capacity of your battery. For example a 5000mAh battery at 1C is pulling 5A, 2C is 10A, 10C is 50A, 30C is 150A, etc. 65C would be pulling 325A. Are your connectors ready for that? For a point of reference, EC5s – one of the best connector options available - are only rated to around 120A continuous.

There are batteries out there, though - I won't name names - that make 65C-rated packs look like paragons of honesty. Yesterday I was looking at an 8000mAh pack that was rated to 150C. 150C. Not only would that discharge the battery in 24 seconds - and blow it up in the process - the current draw would be a ridiculous 1200 amps!

The marketing is mind-blowing, but the math is simple. And the nice thing about math is that it doesn't care about marketing. So the next time you're shopping for batteries, run the numbers, figure out what your model actually needs, and see if what's being advertised makes any kind of rational sense.
http://www.progressiverc.com/blog/

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11-27-2013 06:01 AM  5 years agoPost 12
BradNewman

rrApprentice

Orange, Tx-USA

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Best thing to do is get the highest C rating you can afford, your packs will last longer(lifespan) and your bird will perform at its best with the high C rating!

Remember to keep everything balanced!

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12-21-2013 03:58 PM  4 years agoPost 13
Richardmid1

rrProfessor

Leeds, England

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Best thing to do is get the highest C rating you can afford, your packs will last longer(lifespan) and your bird will perform at its best with the high C rating!
That would actually be the best way to waste money!

That's like telling a new nitro guy the best thing to do is buy the highest nitro content fuel! Not everyone needs that!

C ratings are marketing BS!

The answer for the OP is that 30C packs are 100% fine even for the hardest 3d enthusiasts.

60% of the time, it works every time!

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12-22-2013 07:45 AM  4 years agoPost 14
Noobyflyer

rrVeteran

Clearwater, FL

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Best thing to do is get the highest C rating you can afford, your packs will last longer(lifespan) and your bird will perform at its best with the high C rating!
After everything that's been discussed, this is the conclusion you come to?

Really?

Really!!

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12-22-2013 10:58 PM  4 years agoPost 15
rdalcanto

rrKey Veteran

Salt Lake City, UT

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Can you re-charge faster if it has a higher C-rating?

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12-23-2013 10:08 AM  4 years agoPost 16
Richardmid1

rrProfessor

Leeds, England

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Can you re-charge faster if it has a higher C-rating?
Not necessarily, that is up to the manufacturer (not the cell manufacturer). It also depends how good your charger is as to how fast you can charge a pack.

However I believe battery charge rates are irrelevant as most people have 3-5 flight packs so you can just parallel charge them so no need for high C charging.

60% of the time, it works every time!

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12-23-2013 12:40 PM  4 years agoPost 17
LaDon

rrVeteran

Fort Dodge .Ia

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It all depends on how hard you push the bird. If you fly easy get the lower c rating. If you push it hard I wouldn't go with anything less than a 45c battery. We run 45c and 65c batteries in our 700 and the 65c comes down with less heat in it that the 45c. Heat kills batteries. We also run a goblin 500 with a turnigy 30c 3500 mah battery and killed it in about 6 flights as it come down so hot you about couldn't touch it. Put in the 45c battery and comes down just warm to the touch. So a lot of it has to do with how hard you push the heli. Milliamps is what determines flight time. The difference in weight on the 45c to the 65c is so small that you wont notice any difference in performance due to that. Some of these guys are right get the highest c rating you can afford but a 45c battery will do just about anything. Also get good packs like Pulse or gens ace, thor ,thunder power, but stay away from the dirt cheap ones like turnigy. You will spend more in the long run going with the dirt cheap ones.

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12-23-2013 01:38 PM  4 years agoPost 18
Ace Dude

rrProfessor

USA

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Can you re-charge faster if it has a higher C-rating?
Generally speaking, yes. Higher "C" rated packs typically have higher max charge rates than lower "C" rated packs.

  

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12-23-2013 03:01 PM  4 years agoPost 19
Richardmid1

rrProfessor

Leeds, England

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You will spend more in the long run going with the dirt cheap ones.
There are good and bad dirt cheap ones, Turnigy's actually come into the good category and they also don't come much cheaper!

If you fly in hot weather keeping the packs as cool as possible between flights will be key to making them last.

Also you have to choose between an 'impress your mates' power setup and head speed or an 'enough' power and head speed setup for YOU. The first one will insure that you spend ALOT of money on batteries!

60% of the time, it works every time!

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12-23-2013 03:42 PM  4 years agoPost 20
LaDon

rrVeteran

Fort Dodge .Ia

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The turnigy we bought was this fall so I don't know much newer you can get. I got a friend that flew his Heli this summer and had 2 sets of new ones and after 30 flights puffed. My kid does fly the Heli hard and ours made it 6 flights. Hobby shop gave use a new one to replace it and done in 6 flights. Put a pulse in it without changing a thing and no problems. It is a green pulse as the red ones were junk also. Turnigy and zippy and that cheap junk is only good for foamy airplanes. There you don't push them. Edweld you have spent some good money for a Heli so do yourself a favor and buy some decent batteries. There are several average priced ones that will work well. Spend half that much and you get half the battery also

Team Jr

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