Is 2.1a fast charging?

2.1a is not fast charging; the standard of fast charging is that starting from the initial state of charging, the total charging capacity of the mobile phone within 30 minutes is greater than or equal to 60% of the battery's rated capacity, or within 30 minutes after the start of charging Within minutes, the average current entering the mobile phone battery is not less than 3A (a is the current unit ampere).

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Is 2.1a a fast charger?

2.1a cannot be a fast charger.

The standard for fast charging is: starting from the initial state of charging, the total charging capacity of the mobile phone within 30 minutes is greater than or equal to 60% of the battery's rated capacity, or within 30 minutes after the start of charging, which enters The average current of the mobile phone battery is not less than 3A (a is the current unit ampere).

Extended information

Currently, there are three ways to shorten the charging time:

1. Constant current and increasing voltage: When normal When the current of the charger is maintained at 1a, the 220 volt voltage is reduced to the 5 volt charger voltage, and then the 5 volt charger voltage is reduced to the 4.2 volt battery voltage. When the voltage increases to 9V, the charging time can theoretically be reduced to 50%, but the disadvantage is that it will cause the charger and mobile phone to heat up and damage the battery.

2. Constant voltage current increase: Under constant low voltage conditions, the total current is increased by adding multiple parallel circuits. After branching, the sub-power of each module is not large, and the heat dissipation of the circuit can be well controlled to prevent the mobile phone from heating up.

3. Increase in voltage and current: Although this method of increasing current and voltage at the same time can bring about a considerable increase in charging speed, reducing the heat loss and service life of the circuit is also a big problem. , the technology still needs further development.

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