The most common reasons your iPhone loses battery quickly
Your iPhone battery drains fast because of one or more of these things: apps running in the background, screen brightness set too high, location services turned on for apps that don't need it, or a battery that has straightforward aged past its useful life. The culprit is rarely a single setting — it's usually a combination of habits and features you've left on without realizing the cost.
The second most common reason is that your battery itself is degrading. iPhones use lithium-ion batteries that lose capacity over time. After about 500 full charge cycles (roughly two years of normal use), your battery holds less charge than it did new. You can check your battery's health in Settings > Battery > Battery Health & Charging. If the maximum capacity shows below 80 percent, your battery is the problem, not your settings.
If your battery health is still above 80 percent, the drain is almost certainly caused by apps, screen use, or connectivity features. The good news is that each of these is something you can control right now.
Key Takeaways
- Check your battery health first by going to Settings > Battery > Battery Health & Charging — if it's below 80 percent, the battery itself needs replacement.
- Background app refresh, location services, and high screen brightness account for most fast drain on newer iPhones with healthy batteries.
- Turn off background app refresh for apps that don't need it, lower your screen brightness or enable auto-brightness, and disable location services for apps that only occasionally need it.
- Bluetooth, Wi-Fi, and cellular radios drain battery even when you're not actively using them — turning them off when you leave home saves significant charge.
- If your battery health is below 80 percent, a replacement battery from Apple or an authorized repair shop will restore most of your iPhone's original runtime.
How to check if your battery is worn out
Open Settings, tap Battery, then tap Battery Health & Charging. You will see a number labeled "Maximum Capacity" — this is the percentage of charge your battery can hold compared to when it was brand new. Apple considers a battery healthy if it retains 80 percent or more of its original capacity.
If your maximum capacity is 79 percent or lower, your battery is degraded and is the reason for the fast drain. At that point, replacing the battery is the most direct fix. Apple charges between $69 and $99 for a battery replacement depending on your iPhone model, and the work takes about an hour at most Apple Stores. You can also visit an authorized repair shop, which may charge less.
If your maximum capacity is 80 percent or higher, your battery is still good. The fast drain is caused by settings, apps, or usage habits. Move to the next section to find and fix the culprit.
Background app refresh and location services drain battery the most
Background app refresh lets apps check for new information even when you're not using them. Mail, Messages, News, and social media apps do this constantly. Each check uses your phone's radio and processor, which costs battery. You don't need every app doing this.
Go to Settings > General > Background App Refresh. You will see a list of every app with permission to refresh in the background. Turn off the toggle next to any app you don't need updates from — for example, you probably don't need a game or a flashlight app refreshing in the background. Keep it on for Mail, Messages, and any app you actually want notifications from. This single change often cuts battery drain by 10 to 20 percent.
Location services are equally wasteful. Apps use GPS, which is one of the most power-hungry features on your phone. Go to Settings > Privacy & Security > Location Services. You will see every app that has asked for your location. Tap each app and change the setting from "Always" or "While Using" to "Never" for any app that doesn't genuinely need to know where you are. Maps and weather apps need location. A notes app or a game does not.
Screen brightness and display settings
Your screen is the single largest battery drain on an iPhone. The brighter the screen, the faster the battery empties. If you keep your brightness at maximum, you're losing 15 to 25 percent of your battery life compared to someone using automatic brightness.
Go to Settings > Display & Brightness. Turn on "Auto-Brightness" — this adjusts your screen brightness based on the light around you, so you use less power indoors and in dim conditions. If you prefer manual control, set your brightness to 40 to 50 percent for indoor use. You won't notice the difference, but your battery will last noticeably longer.
Also check Settings > Display & Brightness > Auto-Lock. Set this to 1 minute or 2 minutes — the sooner your screen turns off when you're not using it, the less battery it drains. If you have it set to "Never," your screen stays on constantly, which is one of the fastest ways to kill a battery.
Bluetooth, Wi-Fi, and cellular radios
Bluetooth, Wi-Fi, and cellular radios search for networks and devices even when you're not actively using them. If you leave Bluetooth on all day but only use it for 30 minutes, you're wasting battery for the other 23.5 hours. The same is true for Wi-Fi — your phone searches for networks constantly.
If you're away from home or the office, turn off Wi-Fi and Bluetooth. You can do this from Control Center — swipe down from the top right of your screen and tap the Wi-Fi and Bluetooth icons to turn them off. Turn them back on when you get home. This is especially important if you spend time in areas with weak signals, because your phone uses more power searching for a strong connection.
Cellular data (LTE, 5G) is harder to control, but you can reduce its drain by using Wi-Fi whenever it's available. Wi-Fi uses less power than cellular data for the same amount of downloading.
Apps that drain battery in the foreground
Some apps straightforward use more power than others because of what they do. Video streaming, gaming, navigation, and video calls all demand a lot from your processor and screen. If you use these apps for hours every day, they will drain your battery faster than someone who mostly checks email and texts.
You can see which apps have used the most battery in the last 24 hours or last 10 days. Go to Settings > Battery, and scroll down. The list shows each app and the percentage of your total battery it consumed. If an app you barely use is near the top of the list, it may be running in the background or have a bug. Try closing it completely (swipe up from the bottom of the screen and swipe up on the app) or uninstalling and reinstalling it.
If the top apps are ones you use heavily — like Maps, YouTube, or a game — then the drain is normal. You're straightforward using power-hungry features. The only fix is to use them less or charge more often.
Low Power Mode and when to use it
Low Power Mode reduces performance and background activity to extend battery life. When you turn it on, your phone limits app refresh, reduces screen brightness slightly, and slows down the processor. Most people don't notice the difference in speed, but battery life improves by 15 to 25 percent.
You can turn on Low Power Mode manually from Settings > Battery > Low Power Mode, or set it to turn on automatically when your battery reaches 20 percent. If you find yourself regularly running out of battery before the end of the day, turning on Low Power Mode at 50 percent instead of waiting for 20 percent will keep you going longer without the last-minute panic.
Frequently Asked Questions
Does closing apps in the background actually save battery?
Closing an app from the app switcher does not save battery because the app wasn't actually running — it was suspended. The only exception is if an app has a bug and is stuck using power even when suspended. If you see an app at the top of your battery list that you barely use, close it and see if battery drain improves.
Should I turn off Wi-Fi and Bluetooth to save battery?
Yes, but only if you're not using them. If you're at home or in an office with Wi-Fi, leaving Wi-Fi on uses less battery than using cellular data. If you're using Bluetooth headphones, leaving it on is necessary. Turn them off only when you're away and not using either one.
Does updating to the latest iOS version fix battery drain?
Sometimes. Apple occasionally releases updates that fix battery bugs in specific apps or features. If you're on an older iOS version, updating may help. However, very new iOS versions sometimes have bugs that drain battery faster — if your drain started right after an update, wait a few days for the system to settle, then check again.
What's the difference between maximum capacity and battery health?
Maximum capacity is the percentage of charge your battery can hold compared to new. Battery health is Apple's overall assessment of whether your battery is in good condition. You only see the maximum capacity number in Settings — if it's 80 percent or higher, your battery is considered healthy.
Can I replace my iPhone battery myself?
Apple does not sell batteries for consumer replacement, and opening your iPhone yourself will void your warranty and may damage the phone. Use Apple or an authorized repair shop. Some third-party repair shops offer cheaper battery replacements, but quality varies — check reviews before choosing one.