New Products Flash Sale
Thread Tools
Old Jul 19, 2010, 03:33 PM
airbagit13 is offline
Find More Posts by airbagit13
Plane Destroyer / Life Enjoyer
airbagit13's Avatar
Miami, FL
Joined May 2009
3,613 Posts
Discussion
LIPO batteries: 20c, 30c, whats the difference

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

and

How does this effect my motor?
airbagit13 is offline Find More Posts by airbagit13
Reply With Quote
Sign up now
to remove ads between posts
Old Jul 19, 2010, 03:43 PM
Xpress.. is offline
Find More Posts by Xpress..
Team Hitec, Customer Support
Xpress..'s Avatar
United States, CA, Poway
Joined Oct 2007
23,009 Posts
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.
Xpress.. is offline Find More Posts by Xpress..
Reply With Quote
Old Jul 19, 2010, 04:31 PM
Flyextreme is offline
Find More Posts by Flyextreme
Sure it'll work
Flyextreme's Avatar
United States, CA, Redondo Beach
Joined Nov 2005
4,291 Posts
don't you mean...higher voltage "lower" amps?
Flyextreme is offline Find More Posts by Flyextreme
Reply With Quote
Old Jul 19, 2010, 04:39 PM
Xpress.. is offline
Find More Posts by Xpress..
Team Hitec, Customer Support
Xpress..'s Avatar
United States, CA, Poway
Joined Oct 2007
23,009 Posts
Quote:
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.
Xpress.. is offline Find More Posts by Xpress..
Reply With Quote
Old Jul 19, 2010, 04:46 PM
airbagit13 is offline
Find More Posts by airbagit13
Plane Destroyer / Life Enjoyer
airbagit13's Avatar
Miami, FL
Joined May 2009
3,613 Posts
Thanks man, much appreciated. Don't know why I waited so long to find that out.
airbagit13 is offline Find More Posts by airbagit13
Reply With Quote
Old Jul 19, 2010, 05:46 PM
Flyextreme is offline
Find More Posts by Flyextreme
Sure it'll work
Flyextreme's Avatar
United States, CA, Redondo Beach
Joined Nov 2005
4,291 Posts
Quote:
Originally Posted by Xpress.. View Post
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
Flyextreme is offline Find More Posts by Flyextreme
Reply With Quote
Old Jul 19, 2010, 08:38 PM
rafe_b is offline
Find More Posts by rafe_b
Registered User
Joined Jan 2009
7,643 Posts
Quote:
Originally Posted by Flyextreme View Post
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.
rafe_b is offline Find More Posts by rafe_b
Reply With Quote
Old Jul 19, 2010, 08:47 PM
cutty01 is offline
Find More Posts by cutty01
Registered User
cutty01's Avatar
Bay Area, CA
Joined Apr 2008
291 Posts
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.
cutty01 is offline Find More Posts by cutty01
Reply With Quote
Old May 29, 2016, 09:49 AM
rugged1234 is offline
Find More Posts by rugged1234
Registered User
Joined Mar 2014
5 Posts
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??
rugged1234 is offline Find More Posts by rugged1234
Reply With Quote
Old May 29, 2016, 11:23 AM
slipstick is online now
Find More Posts by slipstick
Registered User
Staffs, UK
Joined Nov 2003
12,301 Posts
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??
No. It is unlikely to make ANY noticeable difference.

Steve
slipstick is online now Find More Posts by slipstick
Reply With Quote
Old May 29, 2016, 11:51 AM
Clive66 is offline
Find More Posts by Clive66
Registered User
Clive66's Avatar
United States, CA, Fontana
Joined May 2011
4,256 Posts
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.
Clive66 is offline Find More Posts by Clive66
Reply With Quote
Old May 29, 2016, 12:54 PM
Thomas B is offline
Find More Posts by Thomas B
Electric Coolhunter
Thomas B's Avatar
United States, TX, Fort Worth
Joined Jun 2000
15,155 Posts
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.
Thomas B is offline Find More Posts by Thomas B
RCG Plus Member
Last edited by Thomas B; May 29, 2016 at 01:00 PM.
Reply With Quote
Old May 29, 2016, 01:08 PM
Clive66 is offline
Find More Posts by Clive66
Registered User
Clive66's Avatar
United States, CA, Fontana
Joined May 2011
4,256 Posts
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.
Clive66 is offline Find More Posts by Clive66
Last edited by Clive66; May 29, 2016 at 01:36 PM.
Reply With Quote
Old May 29, 2016, 08:29 PM
Thomas B is offline
Find More Posts by Thomas B
Electric Coolhunter
Thomas B's Avatar
United States, TX, Fort Worth
Joined Jun 2000
15,155 Posts
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.
Thomas B is offline Find More Posts by Thomas B
RCG Plus Member
Latest blog entry: 2014 events and travel
Reply With Quote
Old May 29, 2016, 08:54 PM
Clive66 is offline
Find More Posts by Clive66
Registered User
Clive66's Avatar
United States, CA, Fontana
Joined May 2011
4,256 Posts
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
Clive66 is offline Find More Posts by Clive66
Last edited by Clive66; May 29, 2016 at 09:06 PM.
Reply With Quote


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Sold Parkzone Habu with (2) 3300mah 4S 30C Blue Lipo Batteries divemasterphil Aircraft - Electric - Jets (FS/W) 9 Apr 19, 2010 09:44 AM
For Sale Supply 20c,30c,40c Lipo battery . now, seeking sales agent at USA market! epbatterray Aircraft - Electric - Batteries & Chargers (FS/W) 0 Mar 23, 2010 11:26 AM
Sold 5S 18.5V 4100mah 20C/30C LIPO REDUCED! markusvt Aircraft - Electric - Batteries & Chargers (FS/W) 8 Oct 16, 2009 08:38 PM
Wanted Looking for 3s a 2200mah 20C-30C Lipo with female Deans connector flyrcehelis Aircraft - Electric - Batteries & Chargers (FS/W) 2 Sep 27, 2009 09:35 PM
New Product FlightPower 20c 30c Batteries Now Distributed By Atlantahobby.com atlav8r Product Announcements 1 Jul 28, 2006 12:41 PM