There is a certain loss. Heat is a common phenomenon when charging mobile phones, especially support fast charging, super fast charging mobile phones, when charging, the current and voltage are larger, so the temperature will be higher than ordinary charging.
If you are conducting wireless charging, because there will be energy loss in the wireless transmission process, and then generate a certain amount of heat, there will be a phenomenon of heat when wireless charging, this is normal.
If the mobile phone supports wireless charging, there is a phenomenon of heat when wireless charging, this is normal, because there will be energy loss in the wireless transmission process, resulting in a certain amount of heat. It is recommended to charge in an environment with relatively good heat dissipation.