To turn on Low Power Mode automatically when your iPhone battery drops, create a personal automation in Shortcuts: use the Battery Level trigger, choose Falls Below, set a percentage, then add the Low Power Mode action and configure the automation to run automatically. On supported iPhones, Apple’s Adaptive Power feature is a built-in alternative that can turn on Low Power Mode at 20%.
Use Shortcuts to choose your own battery threshold
A Battery Level personal automation is the right option if you want Low Power Mode to start at a percentage you choose. Apple’s Shortcuts guide explains how to create an automation and add actions; its Battery Level trigger offers Equals, Rises Above, and Falls Below. For a low-battery trigger, choose Falls Below. Apple’s personal automation instructions and Battery Level trigger details describe these controls.
- Open Shortcuts and start an automation. Tap Automation, then tap the control to create a new personal automation. Follow the on-screen creation flow if your version presents an initial setup screen.
- Choose the battery trigger. Select Battery Level, choose Falls Below, and set the percentage at which you want the automation to run.
- Add the Low Power Mode action. Add the action that controls Low Power Mode and configure it to turn the mode on.
- Set it to run automatically. In the automation editor, choose the automatic-run option rather than requiring confirmation. If the action itself presents an option to run automatically, enable that too; Apple’s guidance notes some actions may need their own automatic-run setting. Save the automation.
Apple also documents Low Power Mode as a separate Shortcuts trigger, with Is Turned On and Is Turned Off choices. That trigger responds to a change in Low Power Mode; it is not a substitute for Battery Level when the goal is to react to a battery percentage. See Apple’s trigger documentation.
Use Adaptive Power for Apple’s built-in 20% behavior
If your iPhone supports Adaptive Power and you do not need to choose a different threshold, enable it in Settings > Battery > Power Mode > Adaptive Power. Apple’s iOS 26 guide says Adaptive Power can turn on Low Power Mode when the battery reaches 20%. The setting is available only on supported models, so check Apple’s current Adaptive Power availability and feature details for your iPhone and software version. Apple says Adaptive Power needs at least seven days to learn charging habits before it engages.
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Adaptive Power and a Shortcuts automation serve different needs: Adaptive Power provides Apple’s documented 20% behavior on supported devices, while Shortcuts lets you set a Battery Level threshold yourself. Apple does not document a user-selected Adaptive Power threshold.
Choose a threshold with Low Power Mode’s trade-offs in mind
Low Power Mode reduces power use by changing or pausing selected behaviors. Apple’s Low Power Mode guidance says it reduces display brightness, sets Auto-Lock to 30 seconds by default, turns off some visual effects, temporarily pauses iCloud Photos, turns off automatic downloads and email fetch, and turns off Background App Refresh. On ProMotion models, the display refresh rate is limited to 60 frames per second, and some tasks may run more slowly.
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Choose a trigger percentage that balances those changes against how much battery reserve you want. A higher threshold activates the reduced-power behavior earlier; a lower threshold preserves normal behavior longer but leaves less charge before it starts.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check Low Power Mode and account for charging behavior
You can check or turn on Low Power Mode manually if needed. The Settings path depends on the iPhone model: on iPhone 15 and later, go to Settings > Battery > Power Mode > Low Power Mode; on iPhone 14 and earlier, go to Settings > Battery > Low Power Mode. Apple says Low Power Mode automatically turns off when iPhone charges to 80% or higher. If you want it on again after charging, your battery-level automation can activate when the charge later falls below its selected threshold.
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