What is the C Rating of a LiPo Battery - RC LiPo Basics

The C rating of the LiPo battery represents a multiplier tied in with Capacity. The main C rating of a LiPo battery refers to the Maximum Discharge rate the battery can sustain continuously for the entire pack.

In this video we will look at:
What is the C Rating?
How to calculate Max Discharge using the C Rating?
Other C Ratings of a LiPo Battery Pack
What C rating is required for my Application?

The maximum discharge rate of the LiPo is highly dependent on the capacity of the battery pack. In general the larger the battery pack in terms of capacity measured in mAh, the higher theoretical maximum continuous discharge rate you should expect. With this being said, the capacity of the battery pack is part of the calculation. We first take the capacity of the battery pack in mAh and convert this to Ah. Next we use the maximum continuous discharge rating in order to perform the calculation. Take these two values and multiply them together.

If we look at the image above consisting of a 4000mAh 4s pack, it has a C rating of 45C. Firstly, 4000mAh is converted to 4Ah. We then take 4Ah and multiply it by 45C. The resulting value is 180 Amps.

Other C ratings of a LiPo battery pack include the charge rate C rating as well as the peak or burst C rating. These values can be found posted by the manufacture of the LiPo battery pack. The important C rating is the one that talks about the charge rate. For RC applications, peak C rating is not as critical as LiPo battery packs should be selected based on continuous operation and not peak.

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