It's not normal.
1. Because it is very common to use a mobile phone charging bank to charge a mobile phone, there will be a certain heat phenomenon during the charging process, but it should not be too obvious.
If the mobile phone charger or charging bank is too hot, there may be a problem with the device or excessive power is used when charging, resulting in too much circuit load.
2. Therefore, in order to avoid affecting the service life and safety of the device, it is recommended to reduce the use of charging heads or charging banks with high charging power.
If the problem is more serious, you need to go to a professional repair shop for consultation and maintenance.
This is a very normal phenomenon, for example, before charging to 70% power, the charging speed is relatively fast, during this period of time, the mobile phone will appear fever, after charging to 80% will enter a trickle state, at this time, the mobile phone has no heat problem, the mobile phone charging heat is mainly due to high charging power, so it will heat up, which is a normal phenomenon. If you do not want the phone to be too hot, but you also need to pay attention to it, do not play with the phone while charging, which will cause battery loss.
Not normal, times is a third party brand, the quality should be passed, if the hot serious certainly not normal
Normal fast charging head, generally more heat than ordinary charger.