To add Low Power Mode shortcut to the home screen on iPhone,
Use Power Reserve
That's right — Low Power Mode! With macOS Monterey, Low Power Mode is an option that you can set to automatically preserve battery life by turning down the screen brightness and system clock speed. It's a feature that works on all the best Macs.
Low Power Mode reduces the amount of power that your iPhone or iPad uses when the battery gets low. To turn Low Power Mode on or off, go to Settings > Battery. You can also turn Low Power Mode on and off from Control Center.
Go to Shortcuts and tap the “My Shortcuts” tab. Tap the + button at the top-right corner. Tap “Add Action”. Type “low power” in the search bar at the top and select “Set Low Power Mode”.
How to turn Low Power Mode on and off on an iPhone or iPad
Thankfully, setting up low power mode on your iPhone is just takes a few simple steps.
Add Low Power Mode Shortcut to Home Screen
Low-power mode similarly disables many useful features, including background processes' use of wireless communications. This limitation makes a smartphone less, well, smart. We recommend using these modes only when you must, rather than as regular battery-saving methods.
Heck, my phone is a few years old, so I practically live in low power mode. But while you're likely familiar with the iPhone's low power mode, it also exists for Macs. That's right, you just might be able to put your laptop in low power mode if it's running low on juice.
By default, the mode automatically disables itself once the charge reaches 90 percent. To turn Battery Saver on manually, choose Battery, then Battery Saver from Android Settings. Tap Turn on now to enable the mode, or choose Set a schedule—this will let you specify what power level will trigger Battery Saver.
You can turn Low Power Mode on or off any time you like, by opening Settings, then tapping Battery and Low Power Mode. You can also add a Low Power Mode toggle switch to the iOS Control Center: from Settings, open Control Center and tap the green plus icon next to Low Power Mode.
Choose a level, say when your phone dips below 50 percent power. Tap Next and you'll see a button that says Add Action. Click that, then search for "low power mode," and choose Set Low Power Mode. And that's it!
Obviously, Low Power Mode has its drawbacks. For instance, you can't use Untethered Hey Siri with Low Power Mode enabled. iOS 9 will also throttle the CPU speed, and prevent visual effects like Live Wallpapers from functioning.
Open Settings, and tap “Control Center” in the list of settings panels. On the Control Center screen, tap “Customize Controls”. Settings will display a list of buttons that you can add to Control Center. Swipe down the list until you find the “Low Power Mode” option and tap the green plus sign to the left of it.