The most common reasons your iPhone battery dies quickly
Your iPhone battery drains fast because something is running in the background, your screen brightness is too high, or the battery itself is aging and holding less charge. The culprit is usually one of three things: an app using too much power, a setting you didn't know was on, or a battery that has completed its useful lifespan.
iPhones show you exactly which apps are draining power fastest. Go to Settings > Battery > Battery Usage and look at the percentage next to each app name. If one app is using more than 20 percent of your battery in a day, that app is the problem. If no single app stands out and the drain is spread across many apps, a setting or the battery itself is more likely the cause.
The second thing to check is your battery's actual health. Go to Settings > Battery > Battery Health & Charging and look at the "Maximum Capacity" number. If it shows 80 percent or lower, your battery has degraded and will not hold a full charge the way it did when new. This is normal wear—all rechargeable batteries lose capacity over time—but it means your phone will need charging more often.
Key Takeaways
- Check which apps are using the most battery in Settings > Battery > Battery Usage, and uninstall or stop using the top drainers.
- Look at your battery's maximum capacity in Settings > Battery > Battery Health & Charging; anything below 80 percent means the battery has degraded and needs replacement.
- Turn off Background App Refresh, location services for apps that don't need it, and reduce screen brightness or enable Auto-Brightness to cut drain significantly.
- If your iPhone is more than three years old and the battery health is below 80 percent, replacing the battery usually solves the problem.
Settings that drain battery without you realizing
Background App Refresh lets apps update their content even when you are not using them. This is useful for email and weather but wasteful for games and social media. Go to Settings > General > Background App Refresh, tap it, and turn it off entirely or turn it off for individual apps you do not need to update constantly.
Location Services uses GPS, which is one of the biggest battery drains on any phone. Go to Settings > Privacy & Security > Location Services and scroll through the list. You will see apps set to "Always", "While Using", or "Never". Change apps to "Never" or "While Using" unless they genuinely need your location all the time. Maps needs it while you are navigating. Your banking app does not.
Screen brightness is the third major drain. If you have brightness set to maximum, your battery will die much faster. Go to Settings > Display & Brightness and either lower the brightness slider or turn on Auto-Brightness, which adjusts brightness based on the light around you. This single change often adds hours to your battery life.
Bluetooth and Wi-Fi also drain battery when they are searching for devices or networks. If you are not using them, turn them off in Control Center (swipe down from the top right). If you leave them on, they use less power when connected to a device or network than when searching, so connecting to your home Wi-Fi and car Bluetooth actually saves battery compared to leaving them on but disconnected.
How to tell if your battery needs replacement
Go to Settings > Battery > Battery Health & Charging and read the "Maximum Capacity" percentage. Apple considers a battery "normal" if it still holds 80 percent of its original capacity. If yours shows 79 percent or lower, the battery has degraded enough that you will notice shorter battery life.
If your iPhone is under warranty or you have AppleCare+, battery replacement is covered if the capacity has dropped below 80 percent. If you do not have coverage, Apple charges a flat fee for battery replacement—the amount varies by iPhone model but is typically between $50 and $70. You can replace it at an Apple Store, an Apple Authorized Service Provider, or through Apple's mail-in repair service.
Do not use third-party battery replacement services unless you have no other option. Non-Apple batteries are often lower quality and may not last as long. If you go to an unauthorized repair shop, you may lose water resistance and other protections Apple built into the phone.
What to do if an app is the culprit
If Settings > Battery > Battery Usage shows one app using far more battery than others, that app has a problem. First, try closing it completely and restarting your phone. Go to Settings > General > iPhone Storage, find the app, and look at how much space it is using. If it is using more than 500 MB, try offloading it: tap the app name, tap "Offload App", and then reinstall it from the App Store. This clears out corrupted files while keeping your data.
If the app still drains battery after reinstalling, the app itself is broken. Check the App Store to see if an update is available—tap the app, then look for an "Update" button. If no update exists or updating does not help, you have two choices: stop using the app, or contact the app maker to report the problem. Many app makers do not know their app drains battery until users tell them.
Social media apps like Facebook, Instagram, and TikTok are known to drain battery faster than most because they run video constantly and track your location. If you use these apps heavily, turning off Background App Refresh for them and limiting location access to "While Using" will help more than anything else.
Temporary fixes when your battery is dying and you need it to last
Low Power Mode reduces performance and background activity to extend battery life by several hours. Swipe down from the top right to open Control Center and tap the battery icon, or go to Settings > Battery > Low Power Mode and turn it on. Your phone will run slower and some features will be limited, but it will last much longer.
If you are in a situation where you need your phone to last until you can charge it, enable Low Power Mode when ready, turn off Wi-Fi and Bluetooth, reduce brightness to the lowest comfortable level, and close all apps running in the background. Close apps by swiping up from the bottom of the screen (or swiping down from the top left on newer iPhones) and swiping up on each app card.
If your battery is at 1 percent and you need to make a call or send a message, put the phone in Airplane Mode first. This turns off all wireless radios and can give you an extra few minutes. Airplane Mode is in Control Center or Settings > Airplane Mode.
When to replace your iPhone instead of just the battery
If your iPhone is more than five years old, the battery is not the only thing that has aged. The processor is slower, the storage may be nearly full, and the operating system is pushing the hardware harder each year. Replacing just the battery might add a few months of life, but you will likely face other problems soon after.
If your iPhone is three to five years old and the battery health is below 80 percent, replacing the battery is worth doing. It usually costs $50 to $70 and will make the phone feel new again. If your iPhone is newer than three years and the battery is already below 80 percent, something else may be wrong—contact Apple to discuss whether repair or replacement is the better option.
Frequently Asked Questions
Does cold weather really make my battery die faster?
Yes. Lithium batteries, which iPhones use, work less efficiently in cold temperatures. If your phone is cold, the battery will drain faster and may even shut down temporarily even though it is not actually dead. Warm it up indoors and the battery will work normally again. Extreme cold can damage the battery permanently, so do not leave your phone outside in freezing weather for long periods.
Will turning off Wi-Fi and Bluetooth save battery?
Only if they are searching for devices or networks. If Wi-Fi and Bluetooth are connected to a device or network, leaving them on uses less battery than turning them off and on repeatedly. If you are not using them at all, turning them off saves a small amount of battery—usually 5 to 10 percent of your daily drain.
Is it bad to charge my iPhone overnight?
Modern iPhones are designed to charge overnight safely. Once the battery reaches 100 percent, the phone stops charging and just maintains the charge. The real battery damage comes from keeping the battery at 100 percent for long periods during the day. If you want your battery to last longer, charge it to 80 percent instead of 100 percent when you can.
Can I use a cheap third-party charger without damaging my battery?
Cheap chargers that do not meet Apple's standards can damage your battery over time because they do not regulate power correctly. Use an Apple charger or a charger certified by the USB-IF (USB Implementers Forum). The certification mark is usually printed on the charger. A good third-party charger costs only slightly more than a cheap one and will protect your battery.
Why does my battery drain faster after I update iOS?
New iOS updates often include features that use more power, and the phone has to index files and process the update for a day or two after installation. If battery drain is noticeably worse after an update, restart your phone and wait 24 hours. If it is still bad, check Battery Usage to see if a specific app is the problem. If the drain is spread across many apps, the update itself may have a bug—check Apple's support page to see if others are reporting the same issue.