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Difference between 15c and 20c lipo worth it?

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Old 07-10-2008, 01:38 AM
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twizler
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Default Difference between 15c and 20c lipo worth it?

I am currently running a 20c 11.1V 640 Mah on hobby-lobby's yak 55 flat foamie. I would like another battery so I can fly it more. Is it really worth the extra money to buy a 20c or is a 15c fine? Thanks in advance.

Sean
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Old 07-10-2008, 01:58 AM
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Default RE: Difference between 15c and 20c lipo worth it?

If you are running close to the max amp rating of the 20c it would be a good idea to stick with it. Changing to a 15c you may notice a drop in power due to the 15c pack voltage dropping off more than the 20C under a load. A 15C 640 will only due 9.15amps max. Do you know how many amps your running at?
Or you could go with a larger pack, say an 800mah-15C or 1000mah-15C. These can do the same or slightly higher amp draw even if they are only 15C due to larger cells.
But if you purchase a pack with a higher discharge than you need (20C) the pack will last longer, run cooler & if you ever upgrade your motor or want to run a larger prop it will save you from have to get new batteries.

I have some packs that may interest you at efuelhobbies.com
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Old 07-10-2008, 06:42 AM
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Default RE: Difference between 15c and 20c lipo worth it?

You need to increase your mAh to get more run time. Changing C rating increases or reduces available power. You should purchase a battery based the amp draw requirement of the motor, if you get one that can't produce the necessary amps it will destroy the battery.
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Old 07-10-2008, 10:21 PM
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twizler
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Default RE: Difference between 15c and 20c lipo worth it?

Thanks for the good answers. I'm not sure how many amps my motor is pulling...I really need to get something to measure Amps and Watts but always spend my money on something else. The motor I'm using is rated for 11 amps constant and 15 amps surge... I think I'll just get another 20C battery.
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Old 07-11-2008, 09:16 AM
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Default RE: Difference between 15c and 20c lipo worth it?

I would say the 15C is border line, if you watch your throttle management you'll be okay. Don't fly it to hard for long burst.
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Old 07-17-2008, 09:41 PM
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Default RE: Difference between 15c and 20c lipo worth it?


Quote:
ORIGINAL: HeliTB

I would say the 15C is border line, if you watch your throttle management you'll be okay. Don't fly it to hard for long burst.
I am getting into elect flying and I am learning. My question about the idea of going from a 20c to a 15c is, if he did this and did not adj prop size and ran full power would'nt it over draw the battery. If I have this right he can draw 20% of amp rating for the battery on a 20c battery , but only 15% on the 15c??????
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Old 07-18-2008, 09:38 PM
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Default RE: Difference between 15c and 20c lipo worth it?


Quote:
ORIGINAL: Stick 40


Quote:
ORIGINAL: HeliTB

I would say the 15C is border line, if you watch your throttle management you'll be okay. Don't fly it to hard for long burst.
I am getting into elect flying and I am learning. My question about the idea of going from a 20c to a 15c is, if he did this and did not adj prop size and ran full power would'nt it over draw the battery. If I have this right he can draw 20% of amp rating for the battery on a 20c battery , but only 15% on the 15c??????

Actually it is 15 X (times) the mAh rating or 20 X (times)

So 1000 mAh @ 15C is 15 amp rated.
1000 mAh @ 20C is 20 amp rated.

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