C: The ratio used to indicate the size of the battery charging and discharging current, also contionous discharge rate.
charge rate = charge current/rated capacity
discharge rate = discharge current/rated capacity
For example:
when a battery with a rated capacity of 100Ah is discharged at 20A, its discharge C rate is 0.2C; discharged at 50A, C rate is 0.5C; discharge at 100A, C rate is 1C; discharge at 200A, C rate is 2C… …
| C Rating | Battery Discharge Time | Discharge Current |
| 2C | 30 mins | 200A |
| 1C | 1 hours | 100A |
| 0.5C | 2 hours | 50A |
| 0.2C | 5 hours | 20A |
Therefore, for a 1200mAh battery, 0.2C means 240mA (0.2 times the rate of 1200mAh), 1C means 1200mA (1 times the rate of 1200mAh)
Battery discharge C rate, 2C, 1C, 0.5C, 0.2C, is the rate at which the battery is discharged. It is a measure to indicate how fast or slow it is discharged.
The capacity used is discharged in 1 hour, which is called 1C discharge; and in 5 hours, which is called 1/5=0.2C discharge. The capacity of a battery can generally be tested by different discharge currents.