What does battery discharge C, 20C, 30C, 3S, 4S mean?

What does battery discharge C, 20C, 30C, 3S, 4S mean?

C: It is used to indicate the ratio of the current when the battery is charged and discharged. It is also called the rate. It is divided into the discharge rate and the charge rate. Generally, it refers to the discharge rate. The rate of 30C is the nominal capacity of the battery*30. The unit is A. After the battery is discharged at a current of 1H/30, it can be calculated that the discharge time is 2 minutes. If the battery capacity is 2AH and 30C is 2*30=60A,

20C and 30C

20C is like a small water pipe + small faucet. 30C is like a large water pipe + large faucet. Large water pipe + large faucet. It can quickly discharge water.

3S, 4S

For example, 1 S means a AA battery, 3S is a battery pack composed of three batteries, and 4S is a battery pack composed of four batteries.

How to choose the C number（Discharge rate） that suits you:

The calculation method of battery rated discharge current, rated discharge current = battery capacity × discharge c number / 1000, such as 3000mah 30c battery, then the rated discharge current is 3000 × 30/1000 = 90a. For example, a 2200mah 30c battery has a rated current of 66a, and a 2200mah 40c battery has a rated current of 88a.

Take a look at how big your ESC is. For example, your ESC is 60A, then you should buy a battery with a rated working current equal to or greater than 60A. This choice can ensure that the battery is sufficient. For those with high requirements, you can choose to leave a certain amount of surplus in the battery, that is, the rated working current of the battery is higher than that of the ESC.

Special note: There are many ESCs for multi-rotor aircraft such as four-axis and six-axis, so there is no need to calculate according to this method. After our actual measurement, the total rated maximum current of general multi-axis aircraft does not exceed 50a, and the super-large rack and large load are also Look up to 60a-80a. The current during normal flight is generally about 40-50% of the maximum current. You don’t have to worry at all.