Question about Samsung Quick charger EP-TA800XB

Hi Balck Widow 666, I would rather recommend the 45Watt one as this is suggested by Samsung.
Samsung EP-TA845 USB-C (45W, Fast Charge, Power Delivery 3.0)
However, the 25W charger will certainly work as well.

That fits. You can also use it to charge the S21 Ultra super fast.