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C-rate is a very important concept that refers to the ratio of the current during charging and discharging of a lithium battery to the nominal capacity of the battery. In other words, C represents the discharge energy of the battery, which is called "discharge rate" in battery terminology, which is the multiple of the discharge current value divided by the battery capacity value. 1C is equivalent to fully discharging (or fully charging) the battery within 1 minute, and so on. 2C is equivalent to a battery that takes 3 minutes (60min, 2C=3 minutes) to fully discharge or fully charge. If the magnification increases, the discharge time will decrease, and vice versa. Therefore, if the discharge is carried out at 0.5C, it means that all the electricity is discharged in 2 hours (60min0.5C=120min2h)

For example, it is easier to understand: if a battery has a capacity of 1.5Ah, then 1C is 1.5A charging and discharging, 2C is 3A charging and discharging, 0.5C is 0.75A charging and discharging. If the battery has a capacity of 2Ah, then 1C is 2A charging and discharging, 2C is 4A charging and discharging, 0.5C is 1A charging and discharging, C represents discharge rate, a few C is the capacity multiplied by a few 1C discharging, which is 1 hour, and 2C is 0.5 hour, 0.5C is 2 hours (the larger the discharge current, the shorter the discharge time). Batteries can be classified into high rate batteries, which can discharge above 10C, while ordinary batteries can only discharge within 3C. To put it more simply, C represents the explosive power of the battery. High rate power batteries have a high instantaneous discharge current, making them particularly suitable for situations with high currents and requiring small size and light weight, such as aircraft models and brushless motors, which are very violent.