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, your screen brightness set too high, or your phone searching for a signal in a weak coverage area. Less often, it's a hardware problem—a battery that has worn out after hundreds of charge cycles, or a component drawing power when it shouldn't.
The fastest way to find out which one is happening is to check your battery usage settings. On any recent iPhone, go to Settings > Battery > Battery Usage. This screen shows you which apps have used the most power over the last 24 hours or the last 10 days. If one app is using 30 percent or more of your battery while you barely use it, that's your culprit.
If the usage is spread evenly across many apps, or if the top apps are ones you use constantly, the problem is usually brightness, location services, or network conditions rather than a single misbehaving app.
Key Takeaways
- Check Settings > Battery > Battery Usage to see which apps are consuming the most power; a single app using over 30 percent is usually the problem.
- Screen brightness, location services running all the time, and poor cellular signal cause drain even when you're not actively using your phone.
- Background App Refresh lets apps update their content even when you're not looking at them; turning it off for specific apps can save significant battery life.
- If battery usage is normal but your phone still dies quickly, your battery itself may have degraded and may need replacement.
- Restarting your iPhone or updating to the latest iOS version fixes many drain problems without any other changes.
How to stop apps from draining battery in the background
Once you've identified a heavy-draining app, you have three options: stop using it, restrict what it can do, or uninstall it.
The easiest first step is to turn off Background App Refresh for that specific app. Go to Settings > General > Background App Refresh, and toggle off the apps you don't need updating when you're not using them. Social media apps, news apps, and email clients are common culprits here—they refresh their content constantly, even when you haven't opened them in hours.
If an app is still draining heavily after you disable Background App Refresh, check whether it has permission to use your location. Go to Settings > Privacy > Location Services, find the app, and change it from Always to While Using or Never. Apps like maps, fitness trackers, and weather services often request "Always" permission but don't actually need it when you're not actively using them.
If the app is still the problem and you rarely use it, uninstalling it is the simplest solution. You can always reinstall it later.
Screen brightness and display settings that waste battery
Your screen is usually the single largest battery consumer on your phone. If you keep brightness at maximum or use an always-on display, you're draining 20 to 40 percent of your battery just on the screen.
Go to Settings > Display & Brightness and turn on Auto-Brightness. This adjusts your screen to match the light around you, so you're not running at full brightness indoors or in dim conditions. You can also lower the maximum brightness slider if you find auto-brightness still too bright.
If you have an iPhone 14 Pro or newer with an always-on lock screen display, that feature alone can drain 5 to 10 percent of your battery per day. You can turn it off in Settings > Display & Brightness > Always-On, or straightforward disable the lock screen widgets that update constantly. If you want to keep the always-on display, at least turn off widgets that refresh frequently, like weather or stock tickers.
Location services, cellular signal, and network drain
Your phone uses significant power when it's searching for a strong cellular signal or constantly using GPS. If you're in an area with weak coverage, your phone works harder to stay connected, and that work drains the battery faster.
Check whether you need location services running all the time. Go to Settings > Privacy > Location Services and review each app. Most apps don't need "Always" permission—maps needs it while you're navigating, but not while you're browsing. Change apps to While Using whenever possible.
If you're in a place with poor signal, consider switching to Wi-Fi calling. Go to Settings > Phone > Wi-Fi Calling and turn it on. This lets your phone use Wi-Fi instead of cellular, which uses less power. If you're somewhere with no signal at all, turn on Airplane Mode temporarily—your phone won't waste power searching for a network it can't find.
Bluetooth and Wi-Fi also drain battery when they're on but not connected to anything. If you're not using them, turn them off in Control Center (swipe down from the top right on newer iPhones, or up from the bottom on older ones).
When your battery itself is wearing out
iPhones have lithium batteries that lose capacity over time. After 500 full charge cycles—roughly two years of normal use—most iPhone batteries retain about 80 percent of their original capacity. After three or four years, they may be down to 60 to 70 percent.
To check your battery's health, go to Settings > Battery > Battery Health & Charging. Look at the Maximum Capacity percentage. If it's below 80 percent and you've owned the phone for two years or more, your battery has degraded normally and is probably the reason for fast drain.
If your maximum capacity is still above 80 percent but your phone still drains very quickly, the problem is not battery wear—it's something else on this list. If maximum capacity is below 50 percent, Apple will usually recommend a battery replacement, which costs between $50 and $70 depending on your model.
You can also see whether iOS has turned on Low Power Mode automatically. This feature limits background activity and reduces performance to stretch battery life when your phone gets low. If it's on all the time, your battery is too worn to hold a full charge, and replacement is the real solution.
Quick fixes: restart and update
Before you change settings or uninstall apps, try the simplest fix first: restart your iPhone. Press and hold the power button and volume down button together 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.
A restart clears temporary files, stops misbehaving background processes, and often fixes drain problems that appeared suddenly. If your battery drain started after you updated iOS, a restart usually helps your phone settle into the new version.
Next, check whether you're running the latest iOS version. Go to Settings > General > Software Update. Apple regularly releases updates that fix battery drain bugs. If an update is available, plug your phone into power and install it—don't try to update on battery alone, because the process uses significant power.
Frequently Asked Questions
Why does my battery drain faster in cold weather?
Lithium batteries work less efficiently when cold. Your iPhone may show a low battery warning or shut down even though the battery isn't actually dead—it just can't deliver power as quickly. The battery recovers when the phone warms up. This is normal and doesn't mean your battery is damaged.
Does closing apps in the app switcher save battery?
No. Closing apps by swiping them away from the app switcher doesn't save battery and may actually waste it, because your phone has to reload the app from scratch the next time you open it. Let iOS manage which apps stay in memory—focus instead on turning off Background App Refresh for apps that don't need it.
Should I turn off 5G to save battery?
5G does use more power than 4G LTE, but usually only by 5 to 10 percent. If you're in an area with strong 5G coverage, the speed gain often makes it worth the battery cost. If you're in a weak 5G area where your phone is constantly switching between 5G and 4G, turning off 5G in Settings > Cellular > Cellular Data Options > Voice & Data can help.
Can I replace my iPhone battery myself?
Apple and some authorized repair shops can replace your battery. Self-repair is possible but requires opening your phone, which risks damaging the screen or other components if you don't have the right tools. Apple's battery replacement service is usually faster and safer, though it costs $50 to $70.
Why does my battery drain faster after I update iOS?
After a major iOS update, your phone indexes files and rebuilds caches in the background for the first day or two. This uses extra power temporarily. Restart your phone and let it sit plugged in overnight—drain should return to normal within 24 to 48 hours. If it doesn't, check Battery Usage to see if a specific app is misbehaving with the new iOS version.