Thanks for your message. I just went outside and tested a Samsung and non-Samsung car charger with the battery settings page open. Fast Wireless Charging displays for 5 seconds, then changes to Charging. At 64% battery, the time remaining to full charge also changes from 1 hour 9 minutes during Fast Wireless Charging to 1 hour 46 minutes for Charging. This happens for both Samsung branded and non-Samsung car chargers. This is a car charging scenario from a car charging adapter plug into a Qi-certified wireless charging car dock via a certified USB-C cable. Use of this same identical dock has worked for others prior to February 1st yet does not appear to work with the current Samsung software update for S21 Ultra and likely other Samsung phone model families like the S20.
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Finally! I'm not alone 🙂 I have also tried multiple non-Samsung 45+ watt car chargers and my S21 Ultra starts Fast Wireless Charging and reverts back to Wireless Charging after 5 seconds. I just ordered the Samsung 45w 12v car charger to see if it does what it claims to do: https://www.amazon.com/gp/product/B089RD7F71/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 This seems like either a secret Samsung proprietary charging configuration or a software glitch. UPDATE: Samsung's chat now posts the following: "Fast wireless charging will only be enabled on devices that have been certified by Samsung and the Wireless Power Consortium. If you are using a non-Samsung wireless fast charger, check with the manufacturer or WPC homepage for the charger's certifications." https://www.wirelesspowerconsortium.com/ UPDATED UPDATE: After purchasing and testing the Samsung proprietary car charger, I see identical results as I see with non-Samsung car chargers of equal ratings, where Fast Wireless Charging turns on for 5 seconds then reverts to the slower Wireless Charging option. This seems like a software bug. I have submitted a bug report through the Samsung Members app but have yet to hear back.
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