At present, the fast charging protocol used by APPLE mobile phones on the charging bank is generally two kinds of Apple 2.4A and USB PD charging.
APPLE 2.4A: This charging method was first applied to the iPad, but the iPhone 6S and later models also support this protocol. APPLE 2.4A power is 5V\/2.4A, theoretically 12W, in the actual test after a loss of about 10W.
USB PD: The general charging treasure USB PD fast charge version is PD 3.0, which supports 5V\/2.4A, 9V\/2A, 12V\/1.5A. In order to use USB PD charging, we also need a Type C-lightning transfer cable, because the price of Apple's first party transfer cable is slightly higher, and the third party cracking is not guaranteed, so there are still many users choose to give up.