My battery seems to take a very long time to charge, I think I have the settings okay to fast charge but it isn't working? Does anyone know how to fix this please
Check to see if your charger has the fast charge icon on it. Also, make sure your cable is intact and not damaged/frayed. If still unsure, just buy a new adapter and cable that is originally intended to charge your phone.
The S21 only supports Max 25 Watts so I believe even if you have a faster charger then 25 Watts it still won't charge faster. The normal is 18watts I guess .