Is it normal for a phone to heat up while being charged by a Xiaomi wireless power bank?

It is normal for the phone to heat up during charging.
If the heat is excessive, please refer to the following solutions:
1. Check for any metal objects on the back of the phone, as they can reduce the power bank's efficiency and cause heating;
2. Also, check if the phone has a protective case, as charging with a case can cause more heat compared to charging without one;
3. Additionally, consider the ambient temperature, as higher temperatures can increase heating during wireless charging.
Note:
Please ensure the case is non-metallic and no thicker than 2mm. It is recommended to use official or officially certified Magsafe cases of iPhone for a more secure fit.