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T-REX 450 › Battery "C" question.
06-08-2009 12:42 AM  9 years agoPost 1
Tonic

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Des Moines

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I should know this but I don't. OK, a battery is labeled 11.1 2100mAh 15C: would the 15C mean that it will put out 150 watts continuously? Or does it mean something else?

Tonic

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06-08-2009 12:57 AM  9 years agoPost 2
Mike Bilyk

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Tulsa, OK - USA

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I believe the C stands for capacity.

so on your 2100 mah pack 1C would equal 2.1 amps.

15c discharge at 2.1 amps would mean that you can discharge the pack at at 31.5 amps.

the same mah pack with a higher C rating say 25C would give you 52.5 amps and more power.

not 100% someone correct me if im wrong.

AMA # 617778
Team MasterCard

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06-08-2009 01:18 AM  9 years agoPost 3
himaxkeith

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Atlantic City NJ. USA

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15c means continuous discharge current. or 31.5A continuous discharge and max charge rate would be 2.1A for your 11.1V 2100 pack.

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06-08-2009 04:13 AM  9 years agoPost 4
Dr.Don

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Cedar Park, TX -- USA

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Above is correct. And by the way, if you are delivering 31.5amps at the nominal 11.1 volts, that is actually over 349 watts.

Dr.Don

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06-08-2009 07:18 PM  9 years agoPost 5
Tonic

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Des Moines

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Thank you all.

OK then. Would it be correct, if you had a motor that was rated 250 watts and you had a 35A esc, that a battery with a higher C rating would not add any benefit.

I'm just trying to understand this from a practical perspective.

Tonic

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06-08-2009 07:45 PM  9 years agoPost 6
trunkmunki

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Bangor

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If you are using a battery 'near' capacity it will get warm. If you use a higher "C" rating, it will end up cooler, and will put less strain on the battery, and may last longer (life, not flight time). Also, it will be more tolerant of burst power spikes.

As for the motor/esc combination, it depends on what the peak power is. You want a battery that can handle the burst loads.

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06-08-2009 11:59 PM  9 years agoPost 7
Tonic

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Des Moines

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This clears up a lot for me, thanks again guys.

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