I am new to electric power and I just bought some life batteries from hobby king. I am trying to understand C rating and how is relates to push or pull (if that makes any sense) will too much C cause my wires to over heat or to damage other items, or will it only supply as much as is needed?

Thanks

Discharge capacity.

Its how fast a battery can discharge if asked, without damaging the cells.

2000mah pack, thats 15C can deliver 30 amps (2000 x 15 = 30,000Mah, divide by 1000 to get amps)

Higher C packs cost a little more and weigh a little more than the same size in a lower C rating.

C is just a multiplier of the pack capacity. So, for a 5000mAh (or 5Ah) battery with a 25C rating, the max discharge current is 5Ah*25=125A. But take those C ratings with a grain of salt. Many companies tend to overrate their packs for marketing purposes. A sure way to tell if you are pulling more than the pack is capable of is by temperature. If the pack gets too warm when pushed to the rated C, then the pack is overrated.

And you can't have a C rating that is too high. A battery does not "push" current into a system. The system determines how much current is required based on motor load. So, if your system is pulling 15A constantly, there will be no difference between a 20C 5000mAh battery and a 2,000C 5000mAh battery. Theoretically, all you'd need is a 3C battery (5Ah*3C=15A) provided it is rated appropriately. But, it's better to use a higher C battery because it won't work as hard to provide the required current, and its life will be longer.

Thanks, I am slow at this stuff, it takes me a few times to understand and fully grasp it. That is what I thought, but I did not want to use something that would fry my stuff.

Thanks again.

I think higher C rating batteries can also be charged at a higher rate (amps) if your charger can deliver the power they can be charged faster.

Batteries tend to have their own charge C rating (typically 1C so by definition about an hour to charge) but more are coming out with say 8C so 60/8 = about 8min charge time if your charger can deliver 8C (24amps for a 3000mah pack!)

Good luck

<div>
</div><div>Not true, and a dangerous assumption. A quality pack should come with instructions, if not then be safe and charge at 1C. Some manufacturers, Hyperion and Thunder Power come to mind, produce packs that can be charged at 1C, 3C and 5C. If able to be charged higher than 1C, they will be labeled as such generally. I have 40C packs that only be charged at 1C. </div>

Actually it is true that I think higher C rated lipos have a higher charge rate- it just might not be correct!<div>That said can you think of a pack that has a low C output rating but a high C charge rating?</div><div>I can think of many that have a low C output and a low C input.</div><div>I can think of many that have a high C output and a high C input.....</div>

I think the advice of reading the specs sheet that comes with a particular pack is the best idea.

Lol, seriously?  'It is true', and 'it just might not be correct'?  Sorry, but that's just funny there.

There may be some correlation but you don't KNOW, thus without some documentation you're guessing. Not good when Lipos are concerned...  [X(]

Yes it is possible to think something is true but be incorrect for example banks thought they gave a true valuation of houses etc, gave loans accordingly and the economy is goosed because their "truth" was incorrect.<div>
</div><div>People used to believe the earth was flat but it is not. It is very possible to think something is true when it's not.</div><div>
</div><div>Anyhow, back on track, I said I think there is a relationship between C charging and C discharge rates which I truly think you agree (but I might be wrong,lol). I advocate using manufacturers recommendations but even then their C ratings need to be taken with a pinch/mountain of salt ( I think this Is factt but I might be wrong....see did it again!!!) </div>

Goldenduff, I know what you mean but in today's age of interweb and Google, it seems pretty easy to look up almost any data. Pretty easy to send an email off to the mfgr or vendor when in doubt. I've gotten free manuals and specs off the web for things that are 25+ years old, yet repeatedly see posts where the most basic questions, things that are in the operating/owner's manual, are asked.

The data about battery C ratings are especially misleading, even more so with the cheaper packs. Reputable lipo suppliers post the 'continuous' and 'peak' discharge rates plainly, yet many suppliers, usually cheaper ones, post the 'peak' without stating such, so one believes the '40C' label must mean continuous, when in fact it's close to peak (5-10sec). Been that way since lipos first came out.

And what ever happened to owning a 'Wattmeter' device?   

It is true , correct, and I also "think so" (but I could be wrong)

Many times it seems that the continuous rating divided by 10 is the continuous charge rate. Pretty soon we'll be charging and using at the same rates.

In the same paragraph you say google an manuals provide answers but ten continue to say the manufacturers are misleading... In this day with so much info you need to take an average of all te data...<div>
</div><div>I have a watt meter an therefore know C ratings are wrong!</div>

The manufacturer's discrepancy I refer to is the marketing/sales side, who either inflate the C rating or label a pack with its peak without pointing it out. I'm surprised you're not aware of this, but now you are. No prob, you're welcome.   

You may be surprised that I do know this.

So you are saying I should believe a manual if the retailer gives it to me but not believe the manual if someone from the marketing/hype dept. gives it to me? With this day and age, google and interweb, it is difficult to know where the (dis)information comes from. You shouldn't believe everything you read, now you know, you're welcome!</p>

Question Please If I have (2) 3cell 2200MHR batteries at a 30-40 C rating I am under the impresion that the 2200 + 2200 = 4400MHR times 30C = 132000MHR or 132Amps is this correct? Or do both the MHR rating and the C rating increase ie 2200 +2200 = 4400MHR and 30C + 30C rating = 60C rating. So 4400MHR x 60C = 264000MHR or 264 Amps. Which is correct? Personally I feel the first example is correct with 132AMPS because the MHR increases and the Crating stays steady?

Yes, it is 132 amps.