The fastest ways to cut iPhone battery use right now

The single biggest drain on iPhone battery is your screen brightness and how long it stays on. Lowering brightness to 30 to 40 percent and setting auto-lock to 1 minute will cut battery use noticeably within a day. After that, turn off location services for apps that do not need it, disable background app refresh for apps you do not use constantly, and switch off Bluetooth and Wi-Fi when you are not using them. These four changes together typically extend battery life by several hours per charge.

If your iPhone is older or the battery has degraded, you may also have a Low Power Mode setting that disables some features to stretch remaining charge. Turning this on manually (rather than waiting for the automatic 20 percent warning) can add hours to your day.

Key Takeaways

  • Reducing screen brightness to 30 to 40 percent and setting auto-lock to 1 minute are the two fastest changes you can make.
  • Location services, background app refresh, and Bluetooth drain battery even when you are not actively using an app, and turning these off for specific apps saves significant power.
  • Low Power Mode disables features like mail fetch and visual effects, and turning it on manually before your battery reaches 20 percent extends charge time by hours.
  • Apps that run in the background or check for updates constantly are the second-biggest drain after screen use, and you can see which ones in Settings.

Adjust screen brightness and auto-lock timing

Your iPhone screen uses more battery than any other component. The brighter the screen and the longer it stays on, the faster your battery drains. Open Settings, tap Display & Brightness, and move the brightness slider down to between 30 and 40 percent. This is low enough to save significant power but high enough to read in most indoor light.

If you find yourself adjusting brightness throughout the day, turn on Auto-Brightness instead. This lets your phone adjust brightness based on ambient light, which often uses less battery than keeping brightness high all the time. In the same Display & Brightness menu, toggle on Auto-Brightness.

Next, set your auto-lock time — how long the screen stays on after you stop using it. Go to Settings, tap Display & Brightness, then Auto-Lock, and choose 1 Minute. This is the shortest option and saves the most battery. If 1 minute feels too short, 2 minutes is a reasonable middle ground.

Turn off location services for individual apps

Location services use your phone's GPS, which is power-hungry. Many apps request location permission but do not actually need it constantly. Go to Settings, tap Privacy & Security, then Location Services. You will see a list of every app that has asked for location access.

For each app, you have four choices: Never, While Using, Always, or Precise Location. Set most apps to Never unless you use that app specifically for navigation or location-based features. For example, a weather app might need location, but a game does not. Maps should be set to While Using so it only uses GPS when you are actively navigating.

Apps set to Always drain battery constantly in the background. If you see an app set to Always and you do not use it for location, change it to While Using or Never. This single change can add an hour or more to your battery life.

Disable background app refresh

Background App Refresh lets apps check for new content and updates even when you are not using them. This is useful for email and messaging apps but wasteful for games, news apps, or social media you check only a few times a day. Go to Settings, tap General, then Background App Refresh.

You will see a toggle at the top to turn off Background App Refresh entirely, and below that a list of individual apps. You do not have to turn it off completely — instead, toggle it off for apps you do not need constant updates from. Keep it on for Mail, Messages, and any app you rely on for notifications. Turn it off for everything else.

If you use a lot of apps, this step takes a few minutes but can extend battery life by 2 to 3 hours per charge.

Turn off Bluetooth and Wi-Fi when not in use

Bluetooth and Wi-Fi both search for and maintain connections, which uses power. If you are not actively using either one, turn them off. Swipe down from the top-right corner of your screen to open Control Center, then tap the Bluetooth icon to turn it off. Do the same for Wi-Fi.

You do not have to leave them off all day — turn them back on when you need them. If you use Bluetooth headphones or a car connection regularly, leaving Bluetooth on is worth the battery cost. But if you only use it occasionally, turning it off saves noticeable power.

One exception: if you use Wi-Fi at home or work, leaving Wi-Fi on and connected to a known network actually uses less battery than letting your phone search for cellular signal. So turn off Wi-Fi only when you are away from your usual networks.

Enable Low Power Mode

Low Power Mode is a built-in setting that reduces performance and disables some features to extend battery life. When you turn it on, your phone stops fetching mail automatically, reduces visual effects, lowers screen refresh rate, and limits background activity. You can turn it on manually at any battery level, not just when you get the automatic warning at 20 percent.

To turn on Low Power Mode, go to Settings, tap Battery, then toggle on Low Power Mode. You can also turn it on from Control Center by swiping down from the top-right corner and tapping the battery icon. When Low Power Mode is on, the battery icon turns yellow.

Low Power Mode typically adds 3 to 4 hours to your remaining battery life. The trade-off is that some features slow down — mail does not arrive as fast, and some animations are disabled — but for most people, the battery gain is worth it.

Check which apps are using the most battery

If you have made the changes above and battery is still draining fast, a single app may be the culprit. Go to Settings, tap Battery, then Battery Usage. You will see a list of apps ranked by how much battery they have used in the last 24 hours or the last 10 days. Tap the dropdown at the top to switch between the two views.

If one app is using significantly more battery than others, you have a few options. First, check if that app has a battery-saving mode in its own settings — many apps like YouTube and Spotify do. Second, limit how often you use it, or delete it if you do not use it regularly. Third, check if the app has a newer version in the App Store, because updates often fix battery drain.

If an app you do not recognize is using a lot of battery, it may be running in the background without your knowledge. Delete it and see if battery life improves.

Frequently Asked Questions

Does turning off notifications save battery?

Turning off notifications saves very little battery — the power cost of a notification arriving is tiny. The real battery drain comes from apps running in the background or checking for updates constantly. If you want fewer notifications, turn them off for peace of mind, but do not expect a big battery improvement.

Should I close apps running in the background?

Closing apps by swiping them away from the app switcher does not save battery. iOS suspends apps automatically when you switch away from them. The only way to stop an app from using battery is to turn off background app refresh for that app in Settings, or to delete it entirely.

Does dark mode save battery on my iPhone?

Dark mode saves battery only on iPhones with OLED screens — iPhone 12 and newer. On older iPhones with LCD screens, dark mode makes almost no difference. If you have a newer iPhone and want to save battery, turning on dark mode in Settings and lowering brightness is a good combination.

What does "Low Power Mode" do to my phone's performance?

Low Power Mode slows down your phone slightly and disables some visual effects, but it does not delete data or harm your phone. You can turn it on and off whenever you want. Most people notice the slowdown only in demanding apps like games or video editing.

Is it bad to leave my iPhone plugged in overnight?

Modern iPhones have built-in protection that stops charging at 100 percent and maintains that level, so leaving your phone plugged in overnight does not damage the battery. However, keeping your battery between 20 and 80 percent most of the time does extend the overall lifespan of the battery over years.