Samsung unveiled the Galaxy Watch7 and Galaxy Watch Ultra yesterday at its Unpacked event, and both models are missing the Wireless PowerShare feature. Previously, this feature allowed you to wirelessly charge past Galaxy Watches on the back of your phone. Unfortunately, this capability is no longer available with these new watches.
The reason behind this change is the new BioActive sensor array that Samsung developed for its latest generation smartwatches. The new design of this sensor array required Samsung to alter the shape of the back glass on the new watches. This modification increased the distance between the internal wireless charging coil of the watch and the wireless charger, making the distance too great for the Wireless PowerShare feature to function with your phone.
On the flip side, Samsung explains that the new sensor array features improved accuracy over previous models, allowing you to "assess health-related data points that were not previously supported as well as take more reliable measurements during prolonged or specialized exercises."
If you're wondering whether you can charge the Watch7 and Watch Ultra on a traditional wireless charging pad, the answer is yes. However, due to the increased distance between the coil and the glass, charging will be slow and generate heat. Therefore, Samsung suggests using the wireless charger included in the box for the best results.