Review on 25W PD 3.0 USB-C Type C Charger Kit [Black] with 5ft Cable - Compatible with Samsung Galaxy S21/S21+/S21Ultra/S20/S20+/Note 20/Note 20 Ultra/Z Fold 3/Z Flip 3/A52/A42/A32 by David Royles

Before leaving a positive rating, go to settings and enable Super Fast Charging. Fast charging and super fast charging are very different things. I'm pretty sure regular fast charging works just fine, BUT. Super fast charging with S21 Ultra KILLS those cheap little chargers after one use. They get very hot and will NOT recharge. I thought it was an accident so I got a replacement and the same thing happened. I've tried 3 different known good cables and the charging box is literally a paperweight just like the first one. Buy a genuine Samsung product and don't risk your phone. illuminated.