Save battery

Your iPhone learns your daily routine and holds the charge near 80 percent, finishing the last part just before you normally unplug it.

Settings > Battery > Charging > Optimized Battery Charging

This screen shows what percentage of its original capacity your battery still holds, and warns you when it has aged enough to affect the phone.

Settings > Battery > Battery Health

Location Services is the master list of every app that can use your position, and the level of access each one has.

Settings > Privacy & Security > Location Services

Background App Refresh lets apps fetch new content while they are closed, which keeps them current at the cost of battery and data.

Settings > General > Background App Refresh

Each app has its own notification switch, plus separate control over the Lock Screen, banners, notification centre, sounds and badges.

Settings > Notifications > App name > Allow Notifications

Low Power Mode cuts background activity and visual effects to stretch the charge you have left, and turns the battery icon yellow while it is on.

Settings > Battery > Low Power Mode

This shows the exact charge as a number in the status bar instead of only a battery shape.

Settings > Battery > Battery Percentage

Dark Mode switches the system and supporting apps to a dark colour scheme, and can follow a schedule such as sunset to sunrise.

Settings > Display & Brightness > Appearance

Your iPhone uses its motion sensors to notice when you lift it and turns the screen on without you pressing anything.

Settings > Display & Brightness > Raise to Wake

The brightness slider sets the base level of the display, and everything else the phone does adjusts around it.

Settings > Display & Brightness > Brightness

You can tell your iPhone never to charge past a chosen percentage, so the battery spends less of its life sitting full.

Settings > Battery > Charging > Charge Limit

Auto-Lock decides how many seconds of no touching pass before the screen turns off and the phone locks.

Settings > Display & Brightness > Auto-Lock

The Battery screen breaks down which apps used your charge over the last day or ten days, and separates screen time from background time.

Settings > Battery

The ambient light sensor raises and lowers screen brightness to match your surroundings, and the switch lives under Accessibility rather than Display.

Settings > Accessibility > Display & Text Size > Auto-Brightness

Instead of going black, the Lock Screen dims to a very low refresh rate and keeps showing the time, your wallpaper and your widgets.

Settings > Display & Brightness > Always On Display

The Bluetooth screen pairs and manages accessories, and switching it off here is different from switching it off in Control Centre.

Settings > Bluetooth

Low Data Mode pauses automatic updates and background tasks and asks apps to use less data, and it can be set separately for cellular and for individual Wi-Fi networks.

Settings > Wi-Fi > Network name > Low Data Mode

Turning Precise Location off for an app gives it an approximate area instead of your exact position.

Settings > Privacy & Security > Location Services > App name > Precise Location

You can let the phone decide when 5G is worth the battery, force it on whenever available, or fall back to LTE only.

Settings > Cellular > Cellular Data Options > Voice & Data

Each app's location access is set individually to Never, Ask Next Time, While Using the App, or Always.

Settings > Privacy & Security > Location Services > App name

MagSafe uses magnets to align a wireless charger with the coil in your iPhone, which charges faster and more reliably than dropping it on a flat pad.

Settings > Battery

System Haptics controls the small taps you feel when using the interface, separately from vibration for calls and alerts.

Settings > Sounds & Haptics > System Haptics

With a high enough power adapter, an iPhone can take a large share of its charge in the first half hour, then deliberately slows for the rest.

Settings > Battery

Shortcuts run sequences of actions, and automations run them on a trigger such as a time, an alarm, arriving somewhere or tapping an NFC tag.

Settings > Apps > Shortcuts

When your iPhone gets warm it deliberately slows or pauses charging to protect the battery, and it may tell you charging is on hold.

Settings > Battery

A single tap anywhere on a dark screen wakes the iPhone, with no button needed.

Settings > Accessibility > Touch > Tap to Wake

This line tells you whether your battery can still supply power fast enough, or whether the phone is limiting performance to stop unexpected shutdowns.

Settings > Battery > Battery Health > Peak Performance Capability

ProMotion lets the display change its refresh rate up to 120Hz for smoother scrolling, and down to a very low rate to save power.

Settings > Accessibility > Motion > Limit Frame Rate

Apps need permission to use Bluetooth, because nearby device signals can be used to work out where you are without using location.

Settings > Privacy & Security > Bluetooth

The wired port charges your iPhone, and on USB-C models it can also send power out to accessories such as headphones or another phone.

Settings > Battery

Your iPhone can shift part of a long charge to times when the local electricity grid is running on cleaner energy.

Settings > Battery > Charging > Clean Energy Charging