If the steam deck charger has a voltage output option that matches your phone (5V) then there is no issue. Current is set by the load in this case since the power convertor in the charger is a voltage generator, not a current generator. So the phone won’t get too much current
If the steam deck charger has a voltage output option that matches your phone (5V) then there is no issue. Current is set by the load in this case since the power convertor in the charger is a voltage generator, not a current generator. So the phone won’t get too much current