iPhone11Promax wireless charging is 7.5W, and supports 18W fast charging, wireless charging function is opened by default, only need to support qi wireless charging protocol charging board to charge the phone, built-in iOS13 system, is one of the smart flagship models launched by Apple in 2019. The battery capacity of iphone xs max is 3179mAh. We used a 7.5W wireless charger with fan active heat dissipation to test the wireless charging of iphone xs max at a constant temperature of 28℃. It only took 2 hours and 56 minutes to fill the iphone xs max. 7.5W charging time more than 20 minutes.