The most common reasons your iPhone battery empties quickly
Your iPhone battery drains fast because something on your phone is using power constantly, or your battery itself is aging. The culprit is usually one of these: a single app running in the background, your screen brightness set too high, location services turned on for apps that don't need it, or a battery that has lost capacity over time. Less often, it's a hardware problem like a failing charging port or a battery that needs replacement.
The fastest way to find out which one is draining your battery is to check the Battery Usage section in Settings, which shows you exactly which apps consumed power in the last 24 hours or the last 10 days. That list almost always points to the real problem.
Key Takeaways
- Open Settings > Battery > Battery Usage to see which apps consumed the most power in the last 24 hours or 10 days.
- High screen brightness, location services running constantly, and background app refresh are the three most common causes of fast drain.
- If Battery Usage shows no single app using more than 20 percent, the problem is likely your battery's age or a hardware issue.
- Batteries naturally lose capacity after 500 full charge cycles; you can check your battery's health in Settings > Battery > Battery Health & Charging.
- If your battery health is below 80 percent or your phone is more than three years old, battery replacement usually solves the problem.
How to check which apps are draining your battery
Go to Settings, tap Battery, then tap Battery Usage. You will see a list of apps ranked by how much power they used. The percentages show what portion of your total battery drain each app caused. If one app is using 30 percent or more, that app is your problem.
Tap any app in the list to see whether it was running in the foreground (while you were using it) or in the background (while your phone was locked or you were using something else). Background drain is the real concern—if an app is using 15 percent of your battery while you are not even using it, something is wrong with that app or its settings.
If you see an app you do not recognize or do not use, uninstall it. If it is an app you do use but it is draining power in the background, go to Settings > Apps > [App Name] > Permissions and turn off Location, Microphone, Camera, and Background App Refresh unless you actually need those features for that app.
Screen brightness and display settings that drain battery fast
Your screen is usually the single largest power consumer on your phone. If you keep brightness at maximum or use an always-on display, your battery will drain noticeably faster. Check your current brightness by swiping down from the top right corner of your screen to open Control Center.
Turn on Auto-Brightness in Settings > Accessibility > Display & Text Size. This adjusts your screen brightness to match the light around you, which uses less power than keeping it high all the time. If you have an iPhone 12 or newer with an always-on lock screen, that feature also drains battery—you can turn it off in Settings > Display & Brightness > Lock Screen and toggle off "Always On".
Location services and background app refresh
Apps that track your location constantly—like maps, weather, and fitness apps—drain battery even when you are not using them. Go to Settings > Privacy & Security > Location Services and review which apps have permission to use your location. For most apps, change the setting from "Always" to "While Using" or turn it off entirely.
Background App Refresh lets apps update their content even when you are not using them. This is useful for mail and messages but wasteful for games and social media. Go to Settings > General > Background App Refresh and turn it off for apps that do not need to update in the background. You can also turn off Background App Refresh entirely if you want maximum battery life.
Battery age and when replacement is the real answer
iPhone batteries lose capacity over time. After about 500 full charge cycles—roughly one year of normal use—a battery typically drops to 80 percent of its original capacity. After two or three years, it may be at 60 to 70 percent. A battery at 60 percent capacity will drain much faster than a new one, even if no single app is the problem.
Check your battery's health by going to Settings > Battery > Battery Health & Charging. Look at the "Maximum Capacity" percentage. If it is below 80 percent, your battery has aged and is the reason for fast drain. If it is below 50 percent, the battery should be replaced. Apple's official battery replacement costs between $50 and $100 depending on your model; third-party repair shops often charge less but may use non-original batteries.
If your Battery Usage list shows no single app using more than 20 percent of power, and your battery health is below 80 percent, battery replacement will almost certainly solve the problem. If your battery health is still above 80 percent, the drain is being caused by an app or a setting, not the battery itself.
Hardware problems that cause battery drain
Occasionally the problem is not software or battery age but a hardware fault. A failing charging port can cause your phone to drain while plugged in, or to charge very slowly. A defective battery can also fail suddenly without showing low health in Settings—this is rare but does happen. If your phone gets hot while charging or during normal use, that is also a sign of a hardware problem.
If you have ruled out apps, settings, and battery age, and your phone still drains unusually fast or gets hot, take it to an Apple Store or an authorized repair shop. They can run a diagnostic test to check the charging port, battery, and other hardware. Do not try to open the phone yourself—modern iPhones are difficult to repair without damaging them.
Quick fixes to try first
Before assuming your battery is failing, try these steps: restart your phone by holding the power button and swiping to power off, then turning it back on. This clears temporary glitches that sometimes cause apps to drain power. Then go to Settings > General > iPhone Storage and delete any apps you have not used in weeks—old apps sometimes have bugs that cause background drain.
If you recently updated iOS, restart your phone and give it a full day of normal use. iOS updates sometimes cause temporary high battery drain while the system indexes files and optimizes itself. If drain is still high after a day, the update is not the cause.
Frequently Asked Questions
Why does my battery drain faster in cold weather?
Lithium batteries lose power faster when cold because the chemical reaction inside them slows down. Your phone may also show 0 percent battery and shut off even though the battery is not truly empty—it will turn back on once it warms up. This is normal and does not mean your battery is damaged.
Does closing apps in the background actually save battery?
No. iOS is designed to pause apps when you are not using them, so closing them manually does not save power. The only exception is if an app is actively draining battery in the background—in that case, uninstalling it or turning off its background permissions actually helps.
Will turning on Low Power Mode really extend my battery life?
Yes. Low Power Mode reduces screen brightness, limits background activity, and slows down processing. It typically extends battery life by 20 to 30 percent. You can turn it on in Settings > Battery > Low Power Mode, or swipe down from the top right and tap the battery icon in Control Center.
Should I charge my iPhone every night or let it drain completely?
Charge it whenever it gets low—there is no benefit to letting it drain completely. Modern iPhones are designed to handle frequent charging. Charging to 100 percent every day does cause slightly faster aging than keeping it between 20 and 80 percent, but the difference is small over a year or two.
Can a software update fix fast battery drain?
Sometimes. If an app has a bug causing high drain, the app developer may release an update that fixes it. Check the App Store for updates to any apps you identified in Battery Usage. If iOS itself is the problem, Apple usually releases a fix within a few weeks of discovering the issue.