The Samsung Galaxy S8 is equipped with a quick rechargeable battery and charger that supports fast rechargeable batteries. This is very useful as it allows the smartphone to be charged to a usable part within a few minutes.
However, charging the battery is always a "stress factor" for the material. Because of the strong current, a permanent rapid charging can have a negative effect, which can affect the entire life cycle of the battery.
But, this has not yet been tested. So if you would like to be on the safe side and treat the battery of the Samsung Galaxy S8 as gently as possible, you can deactivate the quick charging function as follows:
Open the menu from the start screen and then the following submenu:
Settings --> Device maintenance --> Battery
In this submenu you have to tap the symbol with the three points in the upper right corner and then select "Advanced settings". In the "Charging" section you will find the desired option.
Disable now: Quick charge via cable
If you now connect the Samsung Galaxy S8 to the charger, this is charged with a lower charging current, which is gentler for the installed battery. You now know how to switch off the quick charge function for the battery on the Samsung Galaxy S8.