Fast charging and flash charging are both fast charging technology, but the principle of the two is not the same, fast charging is used to improve the charging voltage and speed up the charging speed. The flash charge is to increase the charging current and speed up the charging speed.
The essence of both methods is to improve the charging power, the greater the power, the shorter the charging time. In addition, the low voltage and high current of flash charging will have a higher safety factor than the high voltage and low current of fast charging, but the versatility is poor.