The difference between USB charging and original charger charging

Current

The size of the current will directly affect the speed of cell phone charging, we can not blindly pursue a large current. Cell phone batteries are usually labeled XX MA, such as Samsung I9300 battery capacity is: 2100mAh.

Then look at Samsung i9300 original charger parameters: 5v-1.0a, Output current is 1 A, that is 1000mAh.

The battery 2100mah÷1000mah about a little over 1 hours of charging time.

　　Voltage

As for the voltage, here we can ignore, because the computer's USB interface output voltage is also 5V, the speed of the charge and the voltage relationship is not small, but the computer USB interface of the current output is fixed 500mAh, and the host box in front of the USB interface often appear power shortage situation, even 500mAh can not reach , so if you want to recharge it quickly. But the inferior charger may have voltage instability, voltage instability will lead to mobile phone in charge of the touch screen drift, out of control situation.