Industry jargon

C-rate

C-rate expresses battery charge or discharge current relative to the battery's rated charge capacity. A rate of 1C means a current numerically equal to the battery's ampere-hour capacity, while 0.5C is half that current and 2C is twice it. The notation gives engineers a way to compare charging stress across batteries of different sizes. A 100 Ah battery charged at 100 A is at 1C, while the same current applied to a 200 Ah battery is 0.5C. C-rate is not the same as charger power in kW. Voltage and battery size both affect the power corresponding to a given C-rate.