The power bank and the magnet together make no difference. Because for the charging treasure, the charging treasure that is now sold by the factory is a battery pack composed of lithium batteries that can be repeatedly charged and discharged, and because the lithium battery is a very stable battery, the lithium battery and the magnet will not react, and the charging treasure and the magnet will not react. So it doesn't matter if the phone is next to the magnet
No impact, nothing to do with it.
Of course, because the strong magnet has a strong magnetic field, it will naturally affect the operation of the mobile power supply.