Lithium battery fast charge and slow charge is a relative concept, generally fast charge for high-power DC charging, half an hour can be filled with 80% of the capacity of the battery, slow charge refers to AC charging, the charging process takes 6-8 hours.
The reason why fast charging is fast is caused by different charging voltage and current, and the higher the current, the faster the charging. When it is about to be full, switch to constant pressure, which can prevent the lithium battery from overcharging and can also achieve the role of protecting the battery.