The difference is that fast charging is faster than slow charging, but fast charging does not do much harm to the battery. Here is a look at the comparison between fast charging and slow charging:
1. Slow charge: the mobile phone is slowly charged to 5V1000mA, and the mobile phone charger is actually composed of a stable power supply, mainly a stable voltage power supply, providing stable working voltage and enough current, plus the necessary constant current, voltage limit, time limit and other control circuits.
2 Fast charge: Simply put, it is a charger that can quickly charge the phone, which is called fast charge. Now generally also need a charger: PD fast charge agreement (Apple), or Qualcomm QC technology (Android), these do not need to remember, dare to call themselves fast charge basically will have.
Slow charge adopts constant current charging mode, and automatically turns to trickle charging after full; The fast charge generally uses pulse high current charging, and the polarization reaction in this process will cause the battery temperature to rise rapidly, which will have some impact on the battery life.