This is simple, first of all, the phone needs to support fast charging to go through, only need to replace the charger, such as the 80w fast charge into a 12-watt charging head so that you can achieve fast charge slow charge, in addition to the 80w charging line into a 12-watt charging line, so that the phone will become difficult to charge, but it should be noted that only the fast charge mobile phone slow charge, Slow charging phones can't be fast charging.