After testing, the Samsung s21 ultra wireless charging performed well. It supports fast wireless charging up to 15W, which is significantly faster than a regular 5W or 10W wireless charger. While charging, the phone doesn't get hot, maintaining a comfortable temperature. At the same time, wireless charging is also very convenient, just put the phone on the wireless charger can start charging. Overall, the Samsung s21 ultra's wireless charging function makes the user experience more smooth and convenient.