The speed of your phone charging is caused by following factors

1. USB cable

In general, USB cables that are too cheap are very thin, and they cannot safely transfer enough power from the charger to the phone.

In order to reduce the manufacturing cost, some manufacturers use inferior metals or very thin metal wires in the USB cable, so they cannot perform effective charging work under high power conditions.

2.charging head

The charger head determine the voltage and current , the original or famous band could insure powerful and stable output .

The charging head mainly determines the voltage and current, and the original or large brands can guarantee the full and stable output. The higher the power of the charger, does not mean that the charging speed is faster , but the high power charger is really needed to increase the charging speed.