I have a Galaxy S9+ (with "fast charging"), which requires a USB-C charger. I also have a MacBook Pro with a USB-C charger.
I am curious whether I can (safely) charge my Galaxy S9+ with my MacBook charger. The phone shows that it is charging, and very fast actually.
However, I am not sure whether the charger has too much power and would negatively impact the battery on a short time (perhaps get too hot or even cause physical damage/explode) or long-term (decreased battery health).