The use of magnetic phone cases generally does not have a direct impact on the phone battery. Magnetic phone case is mainly through the built-in magnet adsorption function to protect the phone, and can be easily loaded and unloaded. However, because the mobile phone battery itself is communicated and charged by electrical signals, the magnetic environment may have a small interference with the electromagnetic field, which indirectly affects the working effect of the mobile phone battery. However, this effect is generally small and only in rare cases results in reduced battery life or capacity. Therefore, in summary, the use of magnetic phone cases does not significantly affect the phone battery.