Start in Settings > Battery: check Apple’s Suggestions and Insights, then identify which apps and activities are using power. After that, the most useful changes are to reduce screen brightness, use a shorter Auto-Lock interval, and choose 5G Auto on a supported 5G iPhone. Turn on Low Power Mode when you need to conserve charge; Adaptive Power can make adjustments automatically on eligible iPhones running iOS 26 or later.
1. Find out what is using power before changing settings
Open Settings > Battery. Review any Suggestions and Insights above Daily Usage, then check the app and activity breakdown. Daily Usage compares today with the previous seven days, which can help you distinguish an unusual day from a recurring pattern. Apple’s battery guidance describes battery life as the time a device works before it needs recharging: If the battery in your iPhone or iPad drains too quickly.
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A recent iOS update or device setup can cause temporary background activity. If the drain began at the same time, Apple advises allowing a few days for that work to finish before judging whether the problem persists. A lasting change in battery condition is a different issue; check Battery Health if the problem continues.
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Lower brightness
A dimmer display uses less power. Lower brightness from Control Center or go to Settings > Display & Brightness. The right level depends on visibility and comfort; there is no fixed brightness setting that suits every situation. Apple explains the relationship in Adjust the screen brightness and color on iPhone.
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Keep Auto-Brightness on if it works for you
Auto-Brightness adjusts the display to surrounding light. Find it at Settings > Accessibility > Display & Text Size > Auto-Brightness. Apple warns that turning it off may increase power use, so disabling it is not a general battery-saving fix.
Set a shorter Auto-Lock interval
Go to Settings > Display & Brightness > Auto-Lock and choose a shorter delay if the screen often stays on after you stop using the phone. Apple notes that delaying or preventing Auto-Lock can increase power consumption. A shorter interval is less convenient when you are reading without touching the screen, so choose a practical balance: Keep the iPhone display on longer.
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3. Use 5G Auto when it is available
On a supported 5G iPhone, 5G Auto lets the phone switch to LTE when 5G speeds do not noticeably improve the experience, which can save battery. To find it, open Settings > Cellular or Mobile Service > Cellular Data Options or Mobile Data Options > Voice & Data > 5G Auto. The wording varies by region and iOS version. Apple identifies iPhone 12 models and later and iPhone SE (3rd generation) among supported devices in its battery-drain guidance. LTE may be slower where 5G would otherwise provide a noticeable improvement.
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4. Choose between Low Power Mode and Adaptive Power
Low Power Mode: manual conservation
Use Low Power Mode when you want a deliberate battery-saving mode, such as when you are away from a charger. The route depends on your iPhone:
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- iPhone 15 and later: Settings > Battery > Power Mode > Low Power Mode.
- iPhone 14 and earlier: Settings > Battery > Low Power Mode.
Apple says Low Power Mode turns off automatically once the iPhone charges to 80% or higher. It can reduce brightness, set Auto-Lock to 30 seconds, disable some visual effects, turn off automatic downloads, email fetch, and Background App Refresh, and pause iCloud Photos. On most iPhones it also turns off 5G; iPhone 12 and 13 keep 5G during video streaming and large downloads. On ProMotion models, the refresh rate is limited to 60 Hz. These changes can make the phone feel less responsive or alter how some features behave. See Apple’s Use Low Power Mode to save battery life on your iPhone or iPad.
Adaptive Power: automatic adjustments on eligible models
Adaptive Power is available on eligible models running iOS 26 or later. Apple’s 2026 battery-drain guidance lists iPhone 17 models, iPhone Air, iPhone 16 models, and iPhone 15 Pro and iPhone 15 Pro Max. Find the setting at Settings > Battery > Power Mode. It can make modest adjustments, including slightly lowering brightness, limiting background activity, and adjusting performance; on eligible devices it can turn on Low Power Mode at 20% charge.
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It is not an immediate boost after enabling the feature: Apple says Adaptive Power needs at least seven days to learn charging habits before it engages. Details are in Apple’s About Adaptive Power and battery-drain guidance. If your iPhone does not show the option, its model or software may not support it.
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Battery wear can reduce how long a charge lasts, and settings cannot restore lost battery capacity. Open the appropriate screen for your model:
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- iPhone 15 and later: Settings > Battery > Battery Health.
- iPhone 14 and earlier: Settings > Battery > Battery Health & Charging.
If the screen reports Service, Apple says to consider battery replacement. Its guidance is available in If the battery in your iPhone or iPad drains too quickly and iPhone Battery and Performance.
What to expect from these changes
Apple’s guidance does not promise a specific number of extra minutes or hours from any one setting. Results vary with the iPhone model and battery condition, network conditions, and how you use the phone. For a sensible order of operations, use the Battery screen to locate the likely cause, make targeted display or network changes, and use Low Power Mode when you need a stronger short-term reduction in activity. If the issue persists, Battery Health can help determine whether battery service is relevant.
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