Is there a difference between charging the iphone with a computer and charging it with a power supply? Do different charging methods have any damage to mobile phones?

If you charge from the computer USB port, the current is only 500 mA, while the charger can reach 1000 mA. Therefore, the charger will be faster than the USB port of the computer. The charging current with USB is smaller, which is better for the battery, but the difference is not very big.

The first charge must be fully charged 12 hours. This is suitable for Ni-MH battery equipment without battery control circuit in the early days, but it is a joke for PSP with intelligent charge and discharge control module now. When the PSP battery is fully charged, the charging current will be automatically cut off and displayed as "external power supply" in the system.

Even if you continue to charge 120 hours, the state will not change. Generally speaking, 3 hours is completely full, and the rest of the "charging" is just a waste of your time. On the contrary, when you get a new machine, you should discharge the battery before charging.