The most common reasons your iPhone battery empties quickly
iPhone battery drain usually comes from one of five sources: apps running in the background, screen brightness set too high, location services turned on for apps that don't need it, poor cellular signal forcing your phone to work harder, or an aging battery that no longer holds a full charge. Most of the time it's not a hardware failure — it's a setting or an app you can fix yourself in minutes.
The fastest way to find out what's draining your battery is to open Settings, tap Battery, then Battery Health & Charging. If the Maximum Capacity number is below 80 percent, your battery has degraded and will drain faster than it did when the phone was new. If it's above 80 percent, a setting or app is the culprit, not the battery itself.
Once you know whether it's the battery or something else, you can decide whether to change your habits, adjust settings, or replace the battery. Most people don't need to replace anything — they just need to turn off one or two features.
Key Takeaways
- Check Battery Health & Charging in Settings to see if your battery's maximum capacity has dropped below 80 percent, which means the battery itself is aging.
- Background app refresh, location services, and high screen brightness drain battery faster than almost anything else and can be turned off per app.
- Poor cellular signal or weak Wi-Fi forces your phone to work harder and drains the battery even when you're not using it.
- If your battery health is above 80 percent but drain is still fast, check which apps are using the most battery in Settings under Battery.
How to see which apps are using the most battery
Open Settings, go to Battery, and scroll down to Battery Usage by App. This list shows you every app that has used battery in the last 24 hours or the last 10 days — tap the toggle at the top to switch between them. The apps at the top of the list are the ones draining your battery the fastest.
If an app you rarely use is high on the list, it's probably running in the background even when you're not looking at it. Social media apps, email, maps, and weather apps are common offenders. You can either delete the app, stop it from refreshing in the background, or turn off location services for that app alone.
If a built-in app like Mail or Maps is at the top, the problem is usually that location services or background refresh is turned on for it. You don't need to delete anything — just change the permission.
Turn off background app refresh for specific apps
Background app refresh lets apps check for new messages, updates, or location data even when you're not using them. This is useful for some apps and wasteful for others. Go to Settings, tap General, then Background App Refresh. You'll see a list of every app on your phone.
Turn off the toggle next to any app that doesn't need to refresh when you're not looking at it. Most people can turn it off for social media, news, games, and shopping apps. Keep it on for Mail, Messages, and any app that sends you time-sensitive notifications.
If you want to keep background refresh on overall but turn it off for just one app, you can do that here — toggle off the individual app instead of turning off the whole feature.
Adjust location services to stop apps from tracking your position
Location services use GPS, Bluetooth, and cellular data to figure out where you are. Apps like Maps and weather need it. Apps like Instagram and TikTok don't, but they ask for it anyway. Go to Settings, tap Privacy & Security, then Location Services.
You'll see a list of apps with three options next to each one: Never, While Using, or Always. Set most apps to Never or While Using. Only use Always for apps you genuinely need to know your location at all times — usually just Maps or a fitness app you're actively using.
Turning location off for even two or three apps can noticeably improve battery life, especially if you're in an area with weak cellular signal. When your phone can't get a strong signal, it works harder to pinpoint your location, and that drains the battery faster.
Lower your screen brightness and turn on auto-brightness
Your screen is usually the single biggest battery drain on an iPhone. If you keep brightness at 100 percent all day, your battery will empty much faster than someone who keeps it at 50 percent. Open Settings, tap Display & Brightness, and move the brightness slider down to somewhere between 40 and 60 percent.
Turn on Auto-Brightness in the same menu. This setting adjusts your screen brightness based on the light around you, so you don't have to do it manually. It saves battery because your phone lowers brightness in dim rooms instead of keeping it high all the time.
If you find the screen too dim, you can also turn on Low Power Mode in Settings under Battery. This reduces performance slightly but cuts battery drain by about 20 percent. You can turn it on and off whenever you want — it's not permanent.
Check your cellular signal and Wi-Fi connection
When your phone has weak cellular signal, it works harder to stay connected, and that drains the battery faster. You can't always fix this — sometimes you're just in a place with poor coverage. But if you notice your battery drains fastest in the same location every day, weak signal is probably the reason.
The same thing happens with Wi-Fi. If you're connected to a weak Wi-Fi network, your phone keeps trying to strengthen the connection, which uses battery. If you're in a place with bad Wi-Fi, turn Wi-Fi off and use cellular instead, or vice versa.
If you travel between areas with different signal strengths, you might notice your battery drains faster on certain days. That's normal and not a sign something is wrong with your phone.
When your battery health is below 80 percent
If Battery Health & Charging shows a maximum capacity below 80 percent, your battery has aged and no longer holds as much charge as it did when the phone was new. This happens to every rechargeable battery over time. You can still use your phone normally, but it will need to be charged more often.
Apple offers battery replacement for most iPhones. The cost varies by model, but it's usually between $50 and $100. You can replace the battery at an Apple Store, an Apple Authorized Service Provider, or through Apple's mail-in repair service. If your phone is still under warranty or AppleCare+, the replacement may be free.
You don't have to replace the battery right away. If you're okay charging your phone more often, you can wait. But if the maximum capacity drops below 50 percent, Apple will start showing you a message that your battery needs service.
Frequently Asked Questions
Why does my battery drain even when I'm not using my phone?
Apps running in the background, location services, and cellular signal searching all drain battery when your phone is in your pocket. Background app refresh is the most common culprit. Turn it off for apps that don't need it, and battery drain while idle will drop noticeably.
Does closing apps in the background actually save battery?
Closing apps by swiping up in the app switcher doesn't save much battery. Your phone manages background apps automatically. Turning off background app refresh for specific apps saves much more battery than closing them manually.
Can a software update fix battery drain?
Sometimes. If a bug in iOS is causing an app to use too much battery, a software update can fix it. Go to Settings, tap General, then Software Update to check if an update is available. But most battery drain is caused by settings or aging batteries, not software bugs.
Is it bad to use Low Power Mode all the time?
Low Power Mode reduces performance slightly — apps load a bit slower and some features are limited — but it's safe to use all the time if you want. Many people turn it on at 50 percent battery and leave it on for the rest of the day.
What temperature should my iPhone be to avoid battery drain?
iPhones work best between 50 and 95 degrees Fahrenheit. If your phone gets too hot, it will slow down to protect the battery, which can feel like faster drain. Avoid leaving it in direct sunlight or in a hot car. Cold temperatures don't damage the battery but can make it drain faster temporarily.