The most common reasons your iPhone battery empties quickly

Fast battery drain usually comes from one of three sources: an app running constantly in the background, a setting that keeps your screen or radios active when you don't need them, or a battery that has straightforward worn out after years of charge cycles. The fastest way to find out which one is happening is to check your battery usage data — iOS shows you exactly which apps have used power in the last 24 hours and the last 10 days, and that list almost always points to the culprit.

If your iPhone is less than three years old and the drain is new (not something that happened gradually), a setting or app is almost certainly the cause. If the phone is older or the drain has been slow and steady, the battery itself may be degrading. Both are fixable, but the steps are different.

Key Takeaways

  • Check Settings > Battery > Battery Usage to see which apps consumed the most power in the last 24 hours — the top offender is usually the problem.
  • Background App Refresh, location services, and screen brightness are the settings most likely to drain battery; turning them off for apps you don't need them for saves the most power.
  • If your iPhone is more than three years old, the battery itself may be worn out; Apple can test it and replace it for a fixed fee.
  • Closing apps in the app switcher does not save battery — iOS suspends them automatically — but turning off background activity for specific apps does.

How to read your battery usage data

Open Settings, tap Battery, then tap Battery Usage. You will see a list of apps ranked by how much power they used in the last 24 hours. The percentages show what fraction of your total battery drain each app caused. If one app is using 30 percent or more, that app is the problem — either it is running constantly, or it is doing something power-hungry like video playback or GPS navigation.

Scroll down and tap "Last 10 Days" to see the pattern over a longer period. If the same app dominates both lists, it is definitely the culprit. If different apps lead on different days, your usage pattern is changing — you may be using the camera, maps, or a streaming app more than usual, and that is normal.

The battery usage screen also shows you how much time each app spent actively in use versus how much time it spent in the background. An app that shows high battery use but low active time is running in the background when you are not using it, which is the easiest drain to stop.

Turning off Background App Refresh for specific apps

Background App Refresh lets apps check for new messages, weather updates, or other data even when you are not looking at them. This is useful for mail, messages, and news apps, but wasteful for games, social media, and other apps that do not need to update constantly. Turning it off for the apps that drain the most battery saves significant power.

Go to Settings > General > Background App Refresh. You will see a list of every app on your phone. Toggle off the switch next to any app that does not need to update in the background — games, photo editors, and entertainment apps are safe to disable. Leave it on for Mail, Messages, Calendar, and any app that sends you notifications you care about.

This single change often cuts battery drain by 10 to 20 percent if you have many apps refreshing in the background. It does not affect the app's performance when you open it; it only stops it from working when the app is closed.

Location services and why they drain battery

GPS and location services use significant power because they keep your phone's radios active and constantly calculating your position. Some apps need location all the time — Maps during navigation, Weather for your local forecast, Find My for tracking. Many others ask for location permission but only need it occasionally, or do not need it at all.

Go to Settings > Privacy > Location Services. You will see a list of apps with location permission. Tap each app and choose "Never" if you do not use it for location-based features, or "While Using" if you only need location when the app is open. Choose "Always" only for apps like Maps or Find My that genuinely need background location access.

Apps that have location set to "Always" will show an arrow icon next to their name in the battery usage list. If you see an app there that does not need constant location, changing it to "While Using" or "Never" will reduce its battery drain when ready.

Screen brightness and display settings

Your screen is the single largest power consumer on your phone. If you have Auto-Brightness turned off and your brightness slider set high, or if you are using a high refresh rate on a newer iPhone, the display alone can drain your battery in a few hours of active use.

Go to Settings > Display & Brightness and turn on Auto-Brightness. This lets your phone adjust brightness based on the light around you, which saves power in dim environments. If you find Auto-Brightness too aggressive, you can also lower the brightness slider manually — even reducing it by 20 percent saves noticeable battery life.

On iPhone 13 Pro, 14 Pro, 15 Pro, and newer models, go to Settings > Display & Brightness > Motion and turn on "Limit Frame Rate" if you do not need the 120 Hz refresh rate. This reduces the screen refresh rate to 60 Hz, which uses less power. You will not notice the difference in everyday use, but your battery will last longer.

When the battery itself is wearing out

Every iPhone battery degrades over time. After about 500 full charge cycles — roughly two to three years of normal use — the battery can hold less charge than it did when new. iOS tracks this and shows you the battery's health as a percentage. A battery at 80 percent health still works, but it will not last as long on a single charge.

To check your battery health, go to Settings > Battery > Battery Health & Charging. Look for "Maximum Capacity" — this is the percentage of the battery's original capacity it can still hold. If it is below 80 percent and your phone is more than two years old, the battery is degrading normally. If it is below 50 percent, the battery is significantly worn and replacement will noticeably improve battery life.

Apple can replace your iPhone battery at an Apple Store or Apple Authorized Service Provider. The cost varies by model but is typically between $50 and $100. You can also mail your phone to Apple for battery service. The process usually takes three to five business days.

Other settings that drain battery

Bluetooth, Wi-Fi, and cellular radios use power whenever they are searching for a connection or actively connected. If you are in an area with weak signal, your phone works harder to maintain a connection, which drains battery faster. Turning off Bluetooth when you are not using wireless headphones or speakers saves a small amount of power.

Push notifications also use power because they require your phone to stay connected to Apple's servers. If you receive hundreds of notifications per day, turning off notifications for apps you do not need them from will reduce battery drain slightly. Go to Settings > Notifications and review which apps send you notifications.

Vibration uses more power than sound, so if you have your phone set to vibrate for calls and messages, switching to sound-only mode saves a small amount of battery. This is a minor factor compared to screen brightness or background app refresh, but it adds up if you receive many notifications.

Frequently Asked Questions

Does closing apps in the app switcher save battery?

No. iOS automatically suspends apps when you switch away from them, so they use almost no power while closed. Closing them manually in the app switcher does not save battery and may actually use more power because your phone has to reload the app from scratch the next time you open it. Leave apps in the switcher and instead turn off Background App Refresh for apps that drain power.

Why does my battery drain faster in cold weather?

Cold temperatures slow the chemical reactions inside the battery, which reduces its ability to deliver power. Your iPhone may show a low battery warning or shut down even though the battery is not actually depleted. This is temporary — the battery will work normally again once it warms up. Keeping your phone in a pocket or warm bag helps.

Can I turn off 5G to save battery?

Yes. 5G uses more power than 4G LTE, especially when the signal is weak. Go to Settings > Cellular > Cellular Data Options > Voice & Data and choose "LTE" instead of "5G Auto" or "5G On". You will have slower data speeds, but battery life will improve. This is worth doing if you are away from a charger for long periods and do not need fast data.

What does "Low Power Mode" do?

Low Power Mode reduces performance and background activity to extend battery life. It limits app refresh, reduces screen brightness, and slows down some features. You can turn it on manually in Settings > Battery, or set it to turn on automatically when your battery reaches 20 percent. It typically extends battery life by 1 to 3 hours depending on your usage.

Should I replace my battery if it is at 85 percent health?

Not yet. A battery at 85 percent health is still within the normal wear range for a phone that is one to two years old. Wait until it drops below 80 percent or until you notice the phone shutting down unexpectedly. Replacing the battery early is unnecessary unless the phone is not lasting through your day.