The most common reasons your iPhone battery dies quickly
A fast-draining battery usually comes from one of three sources: an app running constantly in the background, your screen brightness set too high, or your phone searching for a weak cellular signal. Less often, the battery itself is wearing out after years of charge cycles. You can narrow down which one is happening by checking your battery usage settings, which shows you exactly which apps consumed power in the last 24 hours or the last 10 days.
Start by opening Settings, then Battery, then Battery Usage. 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 of your battery in a day when you barely opened it—that app is the culprit. If the percentages look even across many apps, or if the screen itself is listed as using most of the power, the problem is likely your display settings or a weak signal forcing your phone to work harder.
Key Takeaways
- Check Settings > Battery > Battery Usage to see which apps consumed the most power in the last 24 hours or 10 days.
- If one app is using far more battery than others, that app is running constantly in the background and can often be fixed by closing it or changing its permissions.
- Screen brightness, location services, and weak cellular signals are common culprits when battery drain is spread across many apps.
- If your iPhone is more than three years old, the battery itself may be degraded, and you can check its health in Settings > Battery > Battery Health & Charging.
- Turning off background app refresh, reducing screen brightness, and enabling Low Power Mode can extend battery life when ready while you investigate the cause.
How to check which apps are draining your battery
Open Settings on your iPhone. Tap Battery. Tap Battery Usage. You will see two tabs: "Last 24 Hours" and "Last 10 Days." The 24-hour view shows you what happened today; the 10-day view shows you patterns over time. Each app is listed with a percentage of total battery use.
Look for any app using more than 10 to 15 percent of your battery when you did not actively use it much. Common offenders are social media apps (Facebook, Instagram, TikTok), email apps, maps, and music streaming services. These apps often run location tracking, refresh content, or play audio in the background without you realizing it. If you see one app far above the others, that is your starting point.
Fixing apps that drain battery in the background
Once you have identified a draining app, you have three options: close it completely, turn off its background app refresh, or remove its location permissions.
To turn off background app refresh for a specific app, go to Settings, then General, then Background App Refresh. You will see a list of every app on your phone. Toggle off the switch next to the app that is draining your battery. This stops the app from updating or running when you are not actively using it. Many people find this solves the problem when ready.
To remove location permissions, go to Settings, then Privacy, then Location Services. Find the app in the list and tap it. You will see options: "Never," "While Using," or "Always." Change it to "Never" or "While Using" if the app does not need to know your location all the time. Apps like weather or maps need location while you are using them, but social media apps almost never need it.
If an app continues to drain battery even after you turn off background refresh and location access, the app itself may have a bug. Try uninstalling it and reinstalling it from the App Store, or check the app's settings for a "low power" or "battery saver" mode.
Screen brightness and display settings that waste battery
Your screen is often the single largest battery consumer on an iPhone. If you have automatic brightness turned off and your screen set to maximum brightness, it will drain your battery much faster than necessary.
Go to Settings, then Display & Brightness. Turn on "Auto-Brightness." This lets your phone adjust the screen brightness based on the light around you, so it is not always at full power. You can also manually lower the brightness slider if you prefer. Most people find they can comfortably use their phone at 40 to 60 percent brightness indoors.
If you use your phone outdoors in bright sunlight frequently, consider enabling "True Tone" (also in Display & Brightness settings), which adjusts the color temperature of your screen to match the light around you and can reduce eye strain without requiring higher brightness.
Weak cellular signal and location services
When your iPhone cannot find a strong cellular signal, it works harder to maintain a connection, which drains the battery faster. If you are in an area with poor reception—a basement, a building with thick walls, or a rural area—your phone is constantly searching for a signal, and that search uses power.
You can see signal strength in the top left corner of your screen. If you see only one or two bars most of the day, weak signal is likely contributing to battery drain. The only real fix is to move to an area with better coverage or switch to Wi-Fi when available. Turning on Airplane Mode and then turning Wi-Fi back on (so you use Wi-Fi only, not cellular) can help if you are in a place with good Wi-Fi but poor cell signal.
Location Services also drain battery if they are constantly active. Go to Settings, then Privacy, then Location Services. You can turn off Location Services entirely, or go through the list and change apps from "Always" to "While Using" or "Never." Maps and weather apps need location while you are using them, but most other apps do not need it at all.
Checking if your battery itself is worn out
iPhones use lithium batteries that degrade over time. After about 500 full charge cycles (roughly two to three years of normal use), a battery's capacity drops. You can check your battery's health directly in your phone.
Go to Settings, then Battery, then Battery Health & Charging. You will see "Maximum Capacity" as a percentage. If it shows 80 percent or higher, your battery is in good condition. If it shows below 80 percent, the battery has degraded and is not holding a full charge the way it did when new. If it shows below 50 percent, the battery is significantly worn and you may want to consider a replacement.
Apple offers battery replacement at an Apple Store or through an authorized service provider. The cost varies, but is usually between $50 and $100 depending on your iPhone model. If your iPhone is still under warranty or covered by AppleCare+, the replacement may be free or discounted.
Quick fixes you can use right now
While you investigate the root cause, you can extend your battery life when ready by enabling Low Power Mode. Go to Settings, then Battery, then Low Power Mode, and toggle it on. This reduces performance slightly but can add several hours of battery life. Your phone will notify you when battery reaches 20 percent, and you can turn it on manually before that if you need the extra time.
You can also turn off Wi-Fi and Bluetooth when you are not using them (swipe down from the top right corner to open Control Center), close apps running in the background by swiping up from the bottom of the screen, and avoid using your phone while it is charging, as this generates heat and stresses the battery.
Frequently Asked Questions
Why does my battery drain faster in cold weather?
Lithium batteries perform poorly in cold temperatures. Your iPhone may show a low battery warning or shut down even when the battery is not actually empty. The battery recovers when the phone warms up. This is normal and does not mean your battery is damaged. Avoid leaving your phone in a cold car for long periods.
Does closing apps in the background actually save battery?
Closing apps by swiping them away from the app switcher does not save much battery because iOS suspends apps automatically when you are not using them. The exception is if an app is actively running (like music, navigation, or a video call). Turning off background app refresh in settings is far more effective than manually closing apps.
Should I turn off Wi-Fi to save battery?
No. Wi-Fi uses less power than cellular data. If you have a choice between Wi-Fi and cellular, using Wi-Fi will actually extend your battery life. Turn off Wi-Fi only if you are not connected to a network, because searching for networks does use power.
Can I use a third-party battery case to fix fast drain?
A battery case or external power bank will extend the time before you need to charge, but it does not fix the underlying problem causing the drain. If an app is malfunctioning or your battery is degraded, those issues remain. Use a battery case as a temporary solution while you address the root cause.
What if I have tried everything and the battery still drains fast?
If battery drain persists after you have checked app usage, turned off background refresh, lowered brightness, and checked battery health, the battery itself may be failing or there may be a hardware issue. Visit an Apple Store or authorized service provider for a diagnostic test. They can determine whether the battery needs replacement or whether another component is causing the problem.