Even while your iPhone charges, it still uses power to continue operating. If you want to charge your device as quickly as possible, you should turn it completely off before doing so in order to ensure that the phone isn’t using any of the juice it receives. However, if you need the iPhone to remain on while charging so that you can still receive calls and notifications, you can do a few things to make it more power-efficient.
First, close all your open apps. You can do this by opening the app carousel and swiping them all away, but you can also reboot your iPhone, which will close nonessential background processes. Additionally, enabling Low Power Mode can help speed up charging, forcing your iPhone to reduce background activity until switched off. You can find Low Power Mode in the Battery Section of settings and toggle it on from there, and a quick toggle can also be found in Control Center, which is accessed by swiping down from the top-right corner of the iPhone’s home screen. Lastly, do not use your phone while it’s charging, as having the screen on and running apps will use additional power, prolonging the time it takes for the battery to fill up.
