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. Most of the time it is the first two—and both are fixable without replacing anything.
The easiest way to find out which one is draining you is to check your battery usage report. Go to Settings > Battery > Battery Usage, then tap Last 24 Hours or Last 10 Days. You will see a list of apps ranked by how much battery they used. If one app is using far more than the others—say, 40 percent when the next one is 8 percent—that app is your problem. If the percentages are spread evenly across many apps, a setting is likely the culprit.
Key Takeaways
- Check Settings > Battery > Battery Usage to see which apps or settings are draining power; one app using much more than others points to a specific problem.
- Background app refresh, location services, and screen brightness are the most common settings that drain battery; turning them off or limiting them saves power when ready.
- If your iPhone is more than three or four years old, the battery itself may have degraded and lost capacity; check Settings > Battery Health & Charging to see the maximum capacity.
- Closing apps in the switcher does not save battery; what matters is whether the app is running in the background, which you control in Settings, not by swiping.
- If a single app is the problem, uninstalling it or disabling background refresh for that app usually solves the drain within a day or two.
How to turn off background app refresh
Background app refresh lets apps update their content even when you are not using them—so your email app can fetch new messages, or your weather app can refresh the forecast. This is useful, but it drains battery constantly. You can turn it off entirely, or turn it off only for apps that do not need it.
Go to Settings > General > Background App Refresh. You will see a toggle at the top to turn it off for all apps at once. If you want to keep it for some apps and disable it for others, leave the master toggle on and scroll down to turn off the toggle next to individual apps. Most people can safely disable it for social media, games, and news apps. Keep it on for email, messaging, and calendar if you want those to stay current.
After you change this setting, your battery drain should improve noticeably within a few hours. If it does not, move to the next setting.
Reduce location services and screen brightness
Location services use your phone's GPS, which is one of the most power-hungry features. Many apps ask for location permission and then check it constantly, even when you are not using the app. Go to Settings > Privacy & Security > Location Services. You will see a list of every app that has asked for location. Tap each one and change the setting from Always to While Using or Never. Most apps do not need your location all the time—maps needs it while you are navigating, but your banking app does not need it at all.
Screen brightness is the second biggest drain after background activity. Your display uses power every second it is on. Go to Settings > Display & Brightness and turn on Auto-Brightness. This lets your phone adjust brightness based on the light around you instead of keeping it at full brightness all the time. You can also lower the brightness slider manually if you are willing to squint a little.
If your phone has an always-on lock screen display (iPhone 14 Pro and newer), that also drains battery. Go to Settings > Display & Brightness > Lock Screen and turn off Always On if you do not need it.
Check your battery health and maximum capacity
Every time you charge an iPhone, the battery loses a tiny bit of capacity. After a few hundred charge cycles—roughly one per day for a year—you will notice the phone does not last as long. After three or four years, the battery may have lost 20 to 30 percent of its original capacity.
To see how much capacity your battery has left, go to Settings > Battery > Battery Health & Charging. Look for the line that says Maximum Capacity. If it shows 80 percent or higher, your battery is still healthy. If it shows below 80 percent, the battery has degraded and is the reason for the drain. If it shows below 50 percent, the phone will start shutting itself down to protect the battery, which feels like the phone is dying even though the percentage says 30 percent.
If your battery capacity is low, you have two options: replace the battery (Apple charges around $70 to $100 depending on the model, and it takes a few days), or accept that the phone will not last as long and charge it more often. A battery replacement is usually worth it if the phone is otherwise working well.
Disable push notifications and reduce mail fetch frequency
Every time an app sends you a notification, your phone wakes up and lights the screen. If you get dozens of notifications per hour, your phone is waking up constantly. Go to Settings > Notifications and turn off notifications for apps that do not matter to you. You can also tap individual apps and change the notification style from Banner to Silent, which delivers the notification without waking your screen.
Email is a common culprit because it can fetch new messages very frequently. Go to Settings > Mail > Accounts, tap the account you use most, then tap Fetch New Data. Change the setting from Every 15 Minutes or Every 30 Minutes to Hourly or Manually. You will still get email, but your phone will check less often.
When to restart your iPhone or update iOS
Sometimes a single app or process gets stuck and drains battery even though it should not. A restart often fixes this. Hold down the side button and one of the volume buttons until you see the power-off slider, then slide to power off. Wait 10 seconds, then hold the side button again until you see the Apple logo.
If you have not updated your iPhone in a while, an old version of iOS can also cause battery drain. Go to Settings > General > Software Update and install any available update. Apple releases updates that fix battery problems regularly, so staying current helps.
When to contact Apple or replace the phone
If you have turned off background app refresh, reduced location services, lowered brightness, and your battery still drains in a few hours, and your battery health shows 80 percent or higher, something else is wrong. It could be a hardware problem like a failing charging circuit, or a bug in iOS that a restart or update did not fix.
At this point, contact Apple Support or visit an Apple Store. Bring your phone and be ready to show them your battery usage report. They can run diagnostics to see if the battery itself is failing or if something else is the problem. If the phone is under warranty or you have AppleCare+, repair or replacement may be covered. If the phone is old and the repair cost is high, it may be time to replace it.
Frequently Asked Questions
Does closing apps in the app switcher save battery?
No. Closing apps by swiping them away does not save battery because iOS already stops running apps you are not using. What matters is whether the app has permission to run in the background, which you control in Settings, not in the app switcher. Swiping apps away just removes them from your recent list.
Will turning off Wi-Fi and Bluetooth save battery?
Turning off Wi-Fi and Bluetooth saves a small amount of battery, but not much unless you are in a place where your phone is constantly searching for networks. If you are at home or work where Wi-Fi is available, leaving Wi-Fi on actually uses less battery than using cellular data. Turn off Bluetooth only if you do not use wireless headphones or devices.
Is low power mode bad for my battery?
No. Low Power Mode limits background activity and reduces performance slightly, but it does not damage the battery. It is safe to use whenever you want to stretch battery life. You can turn it on in Settings > Battery or by swiping down from the top right and tapping the battery icon.
Why does my battery drain faster in cold weather?
Cold slows down the chemical reactions inside the battery, so it cannot deliver power as quickly. Your iPhone may show a lower percentage or shut down even though the battery is not actually damaged. The battery will work normally again once it warms up. Avoid leaving your phone in a cold car for hours.
Can I use a third-party battery case to fix fast drain?
A battery case adds extra capacity and extends how long your phone lasts, but it does not fix the underlying problem. If an app is draining your battery, a case just delays when you have to charge. Fix the drain first using the steps above, then decide if you still need extra battery life.