The most common reasons your iPhone battery empties fast
Your iPhone loses battery quickly because of one or more of these things: apps running in the background, a screen that stays bright all the time, location services tracking your position constantly, or a battery that has worn out from age. The single biggest culprit is usually your screen brightness or an app that refreshes data even when you are not using it. Older iPhones — typically those more than three years old — lose charge faster because the battery itself degrades over time.
The second most common reason is that your phone is searching for a signal. If you are in an area with weak cellular coverage, your iPhone works harder to stay connected and drains the battery much faster than it would on a strong network. The same happens with Wi-Fi: if your phone cannot find a saved network, it keeps scanning, which uses power.
A third reason is that your phone may be running an older version of iOS. Apple releases updates that often improve battery life, so an outdated operating system can make drain worse. You can check your iOS version in Settings > General > About.
Key Takeaways
- Screen brightness and background app refresh are the two settings that drain battery fastest, and both can be turned down or off in Settings.
- Location services, Bluetooth, and constant Wi-Fi scanning use significant power even when you are not actively using those features.
- A battery older than three years typically holds less charge than a new one, and Apple can test your battery health in Settings > Battery > Battery Health & Charging.
- Weak cellular signal forces your phone to work harder, so battery drain is often worse in areas with poor coverage.
- Updating to the latest iOS version often improves battery life, especially if your phone is several versions behind.
How to check which apps are draining your battery
Go to Settings > Battery to see which apps have used the most power in the last 24 hours or the last 10 days. The list shows the percentage of battery each app consumed. If one app is using far more than the others — say, 40 percent or more — that app is likely the problem.
Common battery hogs include social media apps like Facebook and Instagram, navigation apps like Google Maps, and video streaming apps like YouTube. These apps often run in the background and refresh content constantly. If you see an app using an unusually high percentage, you have three options: uninstall it, stop it from running in the background, or use it less often.
To stop an app from refreshing in the background, go to Settings > General > Background App Refresh, find the app in the list, and toggle it off. This prevents the app from updating data when you are not looking at it, which saves significant battery.
Turn off the features that drain battery the most
Screen brightness is the single biggest battery drain on most iPhones. To reduce it, go to Settings > Display & Brightness and lower the brightness slider, or turn on Auto-Brightness so your phone adjusts the screen to match the light around you. You can also enable Dark Mode (Settings > Display & Brightness > Dark) to use less power on newer iPhones with OLED screens.
Location services drain battery because your phone is constantly using GPS to pinpoint your location. Go to Settings > Privacy & Security > Location Services and turn it off entirely, or scroll down to individual apps and turn off location for apps that do not need it. Maps and weather apps need location, but social media apps usually do not.
Bluetooth and Wi-Fi scanning also use power. Turn off Bluetooth in Settings > Bluetooth when you are not using wireless headphones or speakers. For Wi-Fi, go to Settings > Wi-Fi and turn it off if you are on cellular data, since your phone will stop searching for networks.
Enable Low Power Mode to extend battery life
Low Power Mode reduces the power your phone uses by limiting background activity, lowering screen refresh rate, and reducing performance slightly. You can turn it on manually in Settings > Battery > Low Power Mode, or set your phone to turn it on automatically when the battery reaches a certain level.
When Low Power Mode is on, your phone will not refresh apps in the background, will not read email as often, and will reduce animation effects. For most people, the slowdown is barely noticeable, but the battery life extension is real — often adding several hours to a full charge.
Check your battery health and age
If your iPhone is more than two or three years old, the battery itself may be worn out. Batteries degrade naturally over time and lose the ability to hold a full charge. To check your battery health, go to Settings > Battery > Battery Health & Charging and look at the "Maximum Capacity" percentage.
If the maximum capacity is below 80 percent, your battery is degraded and will not hold as much charge as it did when new. If it is below 50 percent, Apple recommends replacing the battery. You can have Apple replace it at an Apple Store or authorized service provider, or you can use a third-party repair shop, though that may void your warranty.
The Battery Health screen also shows the "Condition" of your battery. If it says "Service Recommended" or "Service Battery," your battery needs replacement soon.
Update iOS and restart your phone
Apple releases iOS updates that often improve battery life. To check for updates, go to Settings > General > Software Update. If an update is available, plug your phone into power and install it. Updates can fix bugs that cause apps to drain battery faster than they should.
A straightforward restart also helps. Hold down the power button and volume button together until the power-off slider appears, then drag it to turn off your phone. Wait 10 seconds, then turn it back on. This clears temporary files and stops apps that may be stuck running in the background.
Reduce notifications and email syncing
Every time your phone receives a notification, it wakes the screen and uses power. Go to Settings > Notifications and turn off notifications for apps you do not need alerts from. You can also turn off badge icons (the red numbers on app icons) and banner notifications for less important apps.
Email syncing also drains battery, especially if your phone is set to fetch new mail every few minutes. Go to Settings > Mail > Accounts > Fetch New Data and change the fetch interval from "Every 15 Minutes" or "Every 30 Minutes" to "Hourly" or "Manually." This means your phone will check for new email less often, saving power.
Frequently Asked Questions
Is it bad to leave my iPhone plugged in overnight?
No. Modern iPhones stop charging at 100 percent and do not overcharge. However, keeping your battery at 100 percent constantly can cause very slow degradation over years. If you want to extend battery lifespan, you can enable Optimized Battery Charging in Settings > Battery > Battery Health & Charging, which limits charging to 80 percent most of the time.
Does closing apps in the background actually save battery?
Not much. Closing apps manually does not save significant battery because iOS suspends apps automatically when you are not using them. The real battery savers are turning off background app refresh for specific apps and disabling location services, Bluetooth, and Wi-Fi when you do not need them.
Why does my battery drain faster in cold weather?
Cold temperatures reduce the chemical reaction inside your battery, making it work less efficiently. Your iPhone may also shut down if it gets too cold, even if the battery is not actually empty. Warm your phone back up and the battery will work normally again. This is temporary and does not damage the battery.
Can I replace my iPhone battery myself?
You can, but it is difficult and risky. Opening an iPhone requires special tools and can damage the screen, water seal, or internal components. Apple and authorized repair shops can replace the battery safely for a fee. Third-party repair shops can also do it, often for less money, though the quality varies.
Does using Wi-Fi instead of cellular data save battery?
Yes, slightly. Wi-Fi uses less power than cellular data, so if you are on a strong Wi-Fi network, your battery will last longer than if you are using 4G or 5G. However, the difference is small unless you are streaming video or downloading large files constantly.