I see LIPO batteries specify a C rating on the label.

LIPO battery C rating

What does that stand for and how does it affect the performance of the battery?


4 Answers 4


The C rating is a multiplier that dictates discharge. You can figure out the maximum theoretical discharge by multiplying the C rating by the capacity. For example an 80C, 1300mAh LiPo can output 80*1.3 = 104 Amps. There is no consensus as far as I am aware as to what the letter C stands for.

It is worth noting that C rating is dubious - comparing the C rating between different manufacturers is unlikely to produce useful results as to which battery is better.

  • $\begingroup$ Ha beat me to it. ;) good answer $\endgroup$
    – anonymous2
    Commented Apr 14, 2020 at 20:25
  • $\begingroup$ @anonymous2 Thank, you too :) $\endgroup$ Commented Apr 14, 2020 at 20:27
  • $\begingroup$ +1. I've never realized "C" in that phrase might have an actual meaning $\endgroup$
    – 3k-
    Commented May 2, 2020 at 19:48

It's a measurement of how fast the battery releases power.

Mathematically, it's the number of times the battery can discharge in a single hour without damaging the battery / overheating.


It tells you how fast the battery can be discharged. The max amp draw is calculated with capacity (Ah) * C-rating.

For example, a 1500mAh 75C battery can handle 112,5A max.

A higher C-rating reduces the risk for voltage sag, and a battery with too low C-rating can be damaged if you try to draw too much current.


What is a C-Rating on a LiPo Battery?

C-Rating is an indicator of the continuous discharge rate of a LiPo. It allows users to easily calculate the maximum constant current you can draw from the LiPo pack safely without harming the battery.

For example, if you have a 3S 1000mAh 20C LiPo pack, your safe max current draw would be 1000mAh x 20C = 20A.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.