The charging or discharging rate of a lithium battery charger is usually expressed in terms of battery capacity. This speed is called the C rate. The C rate is equal to the charging or discharging rate under certain conditions and is usually expressed in terms of battery capacity.
　　 This speed is called the C rate. The C rate is equal to the charging or discharging current under certain conditions and is defined as follows:
　　I=M×Cn
  among them:
　　I = charging or discharging current, AM = multiple or fraction of C
　　C = the value of the rated capacity, AhN = the number of hours (corresponding to C).
　　 Lithium battery charger discharged at 1 times C rate will release the nominal rated capacity within one hour. For example, if the nominal capacity is 1000mAhr, then a discharge rate of 1C corresponds to a discharge current of 1000mA, and a rate of C/10 corresponds to a discharge current of 100mA.
　　Usually, the battery capacity specified by the production brand refers to the capacity when n=5, that is, the discharge capacity in 5 hours. For example, the above battery can provide 5 hours of working time when discharged at a constant current of 200 mA. In theory, the battery can provide 1 hour of working time when discharged at a constant current of 1000 mA.
　　 However, due to the fact that the efficiency of the large battery is reduced when the battery is discharged, the working time at this time will be less than 1 hour.
　　 So how can I charge a lithium-ion battery correctly? The most suitable charging process for a lithium-ion battery can be divided into four stages: trickle charging, constant current charging, constant voltage charging and charging termination.