10C, 15C or 20C?

[aaron1230]

I want to buy more batteries but I can't figure C rating.

Does the C rating have any effect at all on run time good or bad?

If I get 1 MPH at half throttle with a 10C rated battery can
I expect 1.5 MPH at half throttle with a 15C rated battery,
and/or 2 MPH with a 20C battery?
Or is C rating just initial take off and out of corner torque?

Will too high a C rating cause motor harm?

 

[TmaxxKidDuDE]

it means how much power the battery can produce for a amount of time so 15 would be 15000
mA for a short period of time.This page goes into much deeper detail.
http://rclovers.com/whatisCrate.htm

 

[frickenjoey]

The C-rating of the battery tells you the amperage out put the battery is capable of. So so you have a 5000Mah battery that is a 10c. 5000Mah=5 Amps So 5x10=50 Amps. That is the max output of the battery. So a 5000Mah 20c can output double the amps of a 10c....or 100amps. The higher the "C" rating the more punch or torque you will get out of the motor.

The RPM you get is more dependent on the voltage. In the brushless world most motors are rated in KvA. I have a Castle Creations 7700KvA motor in my AE RC-10T4. In theory that motor will spin 7700 RPM for every one volt input to the motor. So I run a 7.4 lipo to it unloaded it will spin 56,980 Rpm.
So long story short.....higher the C-rating means a more powerful battery. So go for the 20c. Hope this helps a bit.

 

[aaron1230]

thanks putting in order now

 

[TmaxxKidDuDE]

Sorry I was not a good help!

 

[ProfsrKos2012]

Sorry I was not a good help!

The link you posted helped me out.

 

[sweetdiesel]

The C-rating of the battery tells you the amperage out put the battery is capable of. So so you have a 5000Mah battery that is a 10c. 5000Mah=5 Amps So 5x10=50 Amps. That is the max output of the battery. So a 5000Mah 20c can output double the amps of a 10c....or 100amps. The higher the "C" rating the more punch or torque you will get out of the motor.

The RPM you get is more dependent on the voltage. In the brushless world most motors are rated in KvA. I have a Castle Creations 7700KvA motor in my AE RC-10T4. In theory that motor will spin 7700 RPM for every one volt input to the motor. So I run a 7.4 lipo to it unloaded it will spin 56,980 Rpm.
So long story short.....higher the C-rating means a more powerful battery. So go for the 20c. Hope this helps a bit.

Great info Joey. The voltage will also drop slightly under load. So if you're doing speed estimates/calculations factor in -.5 to -1.0 volt. High quality/high C rated packs will have less voltage drop under load.

 

[abadk9420]

If you can I would recommend a higher C rating for racing/bashing because you tend to do more full throttle driving putting a heavier load on the batteries, lower C rated batteries don't seem to care for that much and will tend to wear out faster, I would look for a 30C rating or higher for better performance..

 

[aaron1230]

Sorry I was not a good help!

Dude I gain something from every response I get Thanks for reply and Link

can I use charger it is one thst came with 3.7 v 400 mAh 10C batteries on 3.7 v 600 mAh 20C batteries
Charger output is 500mAh
may sound dumb but no electric RC knowledge and I don't want to under charge and jack up new batteries
Thanks in advance

 

[MotoGod]

One important thing to remember as well is the battery is not the hold up in all cases. If your ESC will only draw a max of 80A peak, then putting a battery in that can burst to 200A is useless and you will gain nothing over a battery that can burst 100A.

Also remember that C rating is MAJORLY affected by the battery's capacity.

Example:

5000mah 20C LIPO will handle 100A continuous
8000mah 15C LIPO will handle 120A continuous

So even though the bigger battery has a lower C rating, it can put out higher amperage. So I hear everyone saying 40C LIPOs are the best, but their motor doesn't pull anywhere near that much because of the equipment they are running, so it ends up being overkill...and lost $$$ in the end ;-)

I ran all 5000mah 20C LIPOs in my 8th scale (Castle 2650kv motor) for the second half of this season, and it was MORE than plenty for racing.