Fast charging refers to a charging method that can make the battery reach or close to a fully charged state within 1 to 5 hours. So the main difference between fast charging chargers and ordinary chargers is the charging time. With the continuous update and iteration of mobile phones, the charging time of the mobile phone has been fully charged from 10-15 hours before to 1-2 hours now because of the use of fast charging. A well-known mobile phone’s advertisement "Charge for 5 minutes, talk for 2 hours" is because it uses the fast charging function, charging in a short time can reach the power required for 2 hours of talk.
There are two main directions for increasing the charging speed, one is to increase the voltage and the other is to increase the current. Increasing the voltage will increase the heat production during the charging process, accelerate battery aging and may bring safety hazards, so now the mainstream fast charging method is to increase the charging current. The charging currents of common mobile phone chargers are 0.5A, 1A, and 1.5A. , 2A, 2.5A, 3A, it is generally considered that chargers with a current exceeding 2A including 2A are fast charging chargers, and chargers below 2A are ordinary chargers.
