#c rating

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C Rating Definition

In the context of Lithium-Ion batteries, the letter C refers to the capacity rating of the battery and is a measure of the charge and discharge rates. A breakdown, by Straton Solar, of what this means follows below. C Rating Definition: The C rating indicates the rate at which a battery can be charged or discharged relative to its capacity. Charging and Discharging: A battery with a C rating of…

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What Does "C" Rating Mean on a LiPo Battery

In this entry in our Beginner’s Guide Series, we’re looking into another one of those magical numbers on the outside of every LiPo battery; the “C” Rating.

Simply put, the “C” rating is the cell’s maximum safe continuous discharge rate. Let’s put some numbers down from a LiPo pack for reference: 5000mAh 20C 7.4V (2S).

Before we calculate the discharge rate, we need to convert the mAh to amps. There are 1000mAh in 1amp so, in this case, our 5000mAh pack is equal to 5amps. Now, simply multiply the capacity in amp hours by the packs C rating (in this case, 20C).

5000mAh = 5amps 5amps x 20(C) = 100amps continuous discharge

Using this calculation, you can see we can safely pull up to 100amps continuously from our 5000mAh 20C LiPo without doing any damage.

Let’s check out a few more scenarios:

4500mAh 40C 7.4V LiPo 4500mAh = 4.5amps 4.5amps x 40(C) = 180amps continuous discharge

7200mAh 90C 7.4V LiPo 7200mAh = 7.2amps 7.2amps x 90(C) = 648amps continuous discharge

You can plug in your own numbers from any LiPo pack and to see your safe discharge rate.

Here are two other articles you might be interested in; Understanding LiPo Battery Voltage and LiPo Battery Safety. The LiPo Battery Voltage article is an interview with one of my good friends that works in the LiPo industry. It has a lot of great info on LiPo batteries as well as squashing some misconceptions about this battery type.

Enjoy.

What Does “C” Rating Mean on a LiPo Battery was originally published on CompetitionX