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Old Jul 19, 2010, 04:33 PM
airbagit13 is offline
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LIPO batteries: 20c, 30c, whats the difference


Whats the difference between a 20c and a 30c battery?

and

How does this effect my motor?
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Old Jul 19, 2010, 04:43 PM
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The higher the C rating, the higher the cells are capable of discharging. For example, a 20C 2100 mah lipo can discharge at 42 amps (cell count does not matter), and a 30c 2100 mah can discharge at 63 amps. A higher C rated pack also should be capable of holding its voltage a lot better, so a motor could actually begin to draw more amps because the voltage is higher.
Old Jul 19, 2010, 05:31 PM
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don't you mean...higher voltage "lower" amps?
Old Jul 19, 2010, 05:39 PM
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Originally Posted by Flyextreme View Post
don't you mean...higher voltage "lower" amps?
No, the more voltage you send to a motor, the faster it is going to want to turn. With a load on it, it's going to suck more amps to try and get that load up to rpm.
Old Jul 19, 2010, 05:46 PM
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Thanks man, much appreciated. Don't know why I waited so long to find that out.
Old Jul 19, 2010, 06:46 PM
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No, the more voltage you send to a motor, the faster it is going to want to turn. With a load on it, it's going to suck more amps to try and get that load up to rpm.
I must be thinking about higher voltage packs using less amps to do the same job...my bad?

Bill
Old Jul 19, 2010, 09:38 PM
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don't you mean...higher voltage "lower" amps?
With a given motor and propeller, increasing the number of cells in the battery will greatly increase the current.
Old Jul 19, 2010, 09:47 PM
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Also to add - A higher C rating means a heavier battery and sometime increased dimensions for the same mAh. One positive benefit is that usually, a higher C rating means the lower the internal resistance of the pack. A lower resistance in the pack means you get more voltage delivered to your motor and less heat is generated.

The July 2010 Model Aviation magazine issued by the AMA has an article on this very same subject called "C: What is it all about?" The author suggests that he would rather use a lower C rating and a higher mAh <to get longer flight times> as long as you don't compromise the flight characteristics of the plane.
Old May 29, 2016, 10:49 AM
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change from 25c to 45c


I have a sport cub s2 and there is a 45c battery available . changing to this will make it go faster but not fly longer??
Old May 29, 2016, 12:23 PM
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I have a sport cub s2 and there is a 45c battery available . changing to this will make it go faster but not fly longer??
No. It is unlikely to make ANY noticeable difference.

Steve
Old May 29, 2016, 12:51 PM
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Quote:
Originally Posted by rugged1234 View Post
I have a sport cub s2 and there is a 45c battery available . changing to this will make it go faster but not fly longer??
Won't go any faster & will add a little weight.

The motor on that plane will not perform any better on a higher C rated battery.
Old May 29, 2016, 01:54 PM
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Quote:
Originally Posted by Clive66 View Post
Won't go any faster & will add a little weight.

The motor on that plane will not perform any better on a higher C rated battery.
Actually, it might do a bit better. It will depend on the voltage drop under load that the poster was getting with the old battery and with the new battery. If there is less voltage drop under load wth the new battery, the model will perform a bit better.

No guarantees, as much depends on the quality of all the batteries involved and on how hard the motor is working in the model.

I have had sport models that exhibited slightly but noticeably better performance with a newer higher C battery replacing a lower C battery, shown both by watt meter readings and by flight performance. If the older lower C battery has some mileage on it, the difference can be even more noticeable.

I went from an Eflite 25c 1s 160 lipo in the uMX Spitfire to one of the newer Eflite 45c 1s 160 lipos and it was a very noticeable improvement.
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Last edited by Thomas B; May 29, 2016 at 02:00 PM.
Old May 29, 2016, 02:08 PM
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I have ran a 50c battery on the Sport Cub (saw no difference from the 30c batts i use on it).

Obviously an older battery won't perform as well, but these were both new batteries.
The motor on that plane is not a performance motor (won't take advantage of the additional continuous current a higher c battery can supply).

Added: it's only a 960 kv motor (more speed means a higher pitch prop, & that means checking it with a meter)
Also, the SC only comes with an 18 amp ESC, which means upgrading to at least a 30 amp ESC.
The motor is rated at 25 amp continuous draw, so I wouldn't prop it much past that.
Last edited by Clive66; May 29, 2016 at 02:36 PM.
Old May 29, 2016, 09:29 PM
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Quote:
Originally Posted by Clive66 View Post
I have ran a 50c battery on the Sport Cub (saw no difference from the 30c batts i use on it).

Obviously an older battery won't perform as well, but these were both new batteries.
The motor on that plane is not a performance motor (won't take advantage of the additional continuous current a higher c battery can supply).

Added: it's only a 960 kv motor (more speed means a higher pitch prop, & that means checking it with a meter)
Also, the SC only comes with an 18 amp ESC, which means upgrading to at least a 30 amp ESC.
The motor is rated at 25 amp continuous draw, so I wouldn't prop it much past that.
Pretty sure that the poster is talking about the little 1s Sport Cub S2 and not the larger 3s Sport Cub.

http://www.hobbyzonerc.com/Products/...ProdID=HBZ4400

Based on my experience with the 1s uMX models, he is likely to see a little gain in performance with the 45c battery.
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Old May 29, 2016, 09:54 PM
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Quote:
Originally Posted by Thomas B View Post
Pretty sure that the poster is talking about the little 1s Sport Cub S2 and not the larger 3s Sport Cub.

http://www.hobbyzonerc.com/Products/...ProdID=HBZ4400

Based on my experience with the 1s uMX models, he is likely to see a little gain in performance with the 45c battery.

I've never seen a battery that small with a 45c rating (who sells them ?)
Never mind (just googled it)

Looks like you are correct about my confusion about his plane.
On that little floater. I would prefer run time over a slight speed increase (different strokes for different folk)
It's all good
Last edited by Clive66; May 29, 2016 at 10:06 PM.


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