Fast battery drain usually comes from a few specific causes you can identify and fix yourself
Your iPhone battery drains quickly because something is using power faster than normal — either a background app, a setting left on, or a hardware problem. The most common culprits are location services running constantly, background app refresh pulling data when you are not using the phone, screen brightness set too high, or an app with a memory leak that crashes and restarts repeatedly. Less often, the battery itself is degraded, or a hardware component like the modem or display is drawing excess power.
The good news is that most fast-drain problems are fixable without a repair. You can see exactly which apps are using the most battery, turn off the features you do not need, and test whether the problem stops. If it does not, you have narrowed it down enough to know whether you need a battery replacement or a repair.
Key Takeaways
- Check Settings > Battery to see which apps used the most power in the last 24 hours or 10 days — the top app is usually the culprit.
- Turn off Background App Refresh for apps that do not need to update when you are not looking at them, and disable location services for apps that do not genuinely need your location.
- Reduce screen brightness or enable Auto-Brightness, since the display is often the single largest power draw on an iPhone.
- If battery health has dropped below 80 percent, a battery replacement will usually restore normal drain rates — Apple and authorized repair shops can test this for free.
- Restart your iPhone to clear temporary memory issues, and update to the latest iOS version, since Apple often patches power-drain bugs.
How to check which apps are draining your battery
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 app at the top is using the most energy. Tap it to see whether it was running in the background or only when you were actively using it.
If an app shows high battery use but you barely opened it, that app is running in the background and pulling power even when you are not looking at it. If it shows high use and you were actively using it, the app itself is power-hungry — either by design (video apps, games, navigation) or because it has a bug. Scroll down to see the full list; sometimes the culprit is not the top app but a second or third one that is misbehaving.
You can also tap the clock icon next to each app to see how much time it spent on-screen versus in the background. An app that used 5 percent of your battery but was only on-screen for 2 minutes is draining power in the background and is worth investigating.
Turn off background app refresh and location services
Background App Refresh lets apps update their data even when you are not using them — checking email, loading new messages, refreshing news feeds. This is convenient but drains battery constantly. Go to Settings > General > Background App Refresh and toggle it off entirely, or tap it again to turn it off for individual apps you do not need to update in the background.
Location services are another major drain. Many apps request your location even though they do not strictly need it. Go to Settings > Privacy & Security > Location Services and scroll through the list. For each app, tap it and change the setting from "Always" or "While Using" to "Never" — unless the app genuinely needs your location (Maps, a fitness app that tracks routes, a weather app). Apps like social media, news readers, and games rarely need your location and will work fine without it.
If you use location-based reminders or Find My iPhone, you will want to keep location services on overall, but you can still disable it for individual apps. The goal is to let only the apps that truly need your location have access to it.
Reduce screen brightness and enable low-power mode
The iPhone display is usually the single largest power consumer. If your screen brightness is set to maximum, it will drain the battery much faster than necessary. Go to Settings > Display & Brightness and either lower the brightness slider manually or toggle on Auto-Brightness, which adjusts the screen to match the light around you.
Enable Low Power Mode to reduce overall power consumption. Go to Settings > Battery and toggle on Low Power Mode. This limits background activity, reduces performance slightly, and turns off some visual effects, but it can extend battery life by several hours. You can also set Low Power Mode to turn on automatically when your battery reaches a certain percentage — tap Battery > Low Power Mode > Turn On Automatically and choose 20 percent or 10 percent.
Restart your iPhone and update iOS
A restart clears temporary memory and stops any background processes that may be stuck in a loop. Hold down the power button and either volume button until the power-off slider appears, then drag it to turn off the phone. Wait 10 seconds, then press the power button again to turn it back on. This straightforward step fixes battery drain caused by software glitches about half the time.
Check whether you are running the latest version of iOS. Go to Settings > General > Software Update. If an update is available, connect to Wi-Fi and plug in your phone, then install it. Apple regularly releases updates that patch power-drain bugs, and you may be running an older version with a known issue.
Check your battery health and consider a replacement
iPhones have a built-in battery health report. Go to Settings > Battery > Battery Health & Charging. You will see a percentage labeled "Maximum Capacity" — this is how much charge your battery can hold compared to when it was new. If it is below 80 percent, the battery is degraded and will drain faster than normal. A replacement battery will usually restore normal drain rates.
Apple and authorized repair shops can replace the battery for a fee that varies by iPhone model — typically between $50 and $100. If your phone is still under warranty or you have AppleCare+, the replacement may be free or discounted. You can also check whether your iPhone is may be able to access for a battery replacement under a recall program by visiting Apple's support page and entering your serial number.
If your battery health is above 80 percent but your phone is still draining fast, the problem is not the battery itself — it is a setting, an app, or another hardware component. In that case, a battery replacement will not help, and you should focus on the steps above.
When to contact Apple or a repair shop
If you have turned off background app refresh, disabled location services, lowered screen brightness, restarted your phone, and updated iOS, but the battery still drains in a few hours, the problem is likely hardware-related. Contact Apple Support or visit an Apple Store to have them run a diagnostic. They can test whether the battery is degraded, whether the display is drawing excess power, or whether another component is failing.
Do not assume you need a new phone. Most battery-drain problems are fixable with a battery replacement, a software update, or a settings change. A diagnostic will tell you exactly what is wrong and what it will cost to fix.
Frequently Asked Questions
Why does my battery drain faster in cold weather?
Cold temperatures slow down the chemical reactions inside the battery, making it deliver power more slowly. Your iPhone may show a lower percentage than it actually holds, and it may shut down unexpectedly even though the battery is not truly empty. Warm the phone to room temperature and the battery will recover. This is normal and does not mean the battery is damaged.
Does closing apps in the app switcher save battery?
No. Closing apps does not save battery because iOS automatically suspends apps you are not using. Closing them manually just forces iOS to reload them from scratch the next time you open them, which actually uses more power. Leave your apps in the app switcher and let iOS manage them.
Can a specific app be draining my battery without showing up in Battery Usage?
Rarely. The Battery Usage list is accurate and includes all apps that used significant power. If an app is not on the list, it is not the problem. However, if you suspect a particular app, you can uninstall it for a few days and see whether battery drain improves. If it does, the app was the culprit.
Does turning off Wi-Fi and Bluetooth save battery?
Turning them off saves a small amount of battery, but not much — usually a few percent per day. If your battery is draining in hours rather than days, Wi-Fi and Bluetooth are not the main problem. Focus on the bigger drains: screen brightness, background app refresh, and location services.
Is it bad to use Low Power Mode all the time?
No. Low Power Mode straightforward reduces performance and background activity; it does not damage the battery. You can use it every day if you want longer battery life. The only downside is slightly slower performance, which most people do not notice during normal use.