The most common reasons your iPhone battery empties quickly
iPhone battery drain usually comes from one of three sources: apps running in the background, screen brightness set too high, or a battery that has physically degraded over time. The fastest way to find out which one is draining yours is to open Settings > Battery > Battery Health & Charging and look at the Maximum Capacity number. If it shows 80 percent or lower, your battery itself is worn out and will drain faster than it did when new. If it shows 85 percent or higher, something else is consuming power.
The second step is to check which apps are using the most battery. Go to Settings > Battery and scroll down to see a list of apps ranked by how much power they have used in the last 24 hours or the last 10 days. Apps that appear at the top of this list — especially ones you do not use often — are the most likely culprits. Social media apps, navigation apps, and streaming services drain battery fastest because they keep your screen on, use location services, or play video continuously.
Screen brightness is the third major drain. If your brightness is set to maximum or if you have Auto-Brightness turned off, your display is working harder than it needs to. The screen is usually the single biggest power consumer on any phone, so even a small brightness reduction can add hours to your battery life.
Key Takeaways
- Check your battery's maximum capacity in Settings > Battery > Battery Health & Charging; if it is below 80 percent, the battery itself is degraded and will drain faster than normal.
- Open Settings > Battery to see which apps have used the most power in the last 24 hours, and uninstall or stop using the ones you do not need.
- Screen brightness is the largest power drain on most iPhones; turning on Auto-Brightness or lowering brightness manually can add several hours of battery life.
- Background app refresh, location services, and push notifications all drain battery; you can turn these off per app in Settings without losing core phone function.
How to read your battery usage report
The Battery section in Settings shows two different time windows: the last 24 hours and the last 10 days. The 24-hour view is more useful if you are trying to solve a sudden drain problem that happened today. The 10-day view shows your overall pattern and is better for spotting apps that drain battery slowly but constantly.
Next to each app name, you will see a percentage. This is the share of total battery that app used, not the percentage of the app's own battery capacity. If an app shows 15 percent, it means that app consumed 15 percent of all the power your phone used during that time window. An app at the top of the list with 25 percent is using roughly twice as much power as an app at 12 percent.
Tap any app name to see more detail. You will see a breakdown of how that app used power: screen time, background activity, location services, or other functions. This tells you whether the app is draining battery because you are actively using it (screen time) or because it is running in the background without you knowing.
Background app refresh and location services
Background app refresh lets apps update their content even when you are not using them. Maps can refresh your route, Mail can check for new messages, and Weather can update the forecast. This is convenient but costs battery. You can turn it off globally in Settings > General > Background App Refresh, or turn it off for individual apps by going to Settings > General > Background App Refresh and toggling off the apps you do not need to update in the background.
Location services let apps know where you are. Navigation apps need this constantly. Social media and weather apps use it occasionally. Some apps request location permission but rarely actually use it. Go to Settings > Privacy & Security > Location Services to see which apps have permission. Turn off location for apps that do not need it, or set them to "While Using" instead of "Always" so they only use location when you are actively using the app.
Push notifications also drain battery because they wake your phone and light up the screen. If you have dozens of apps sending notifications, your phone is waking up dozens of times a day. Go to Settings > Notifications and turn off notifications for apps you do not need alerts from. You can also turn off notification sounds and badges to reduce the number of times your phone wakes up.
Screen brightness and display settings
Your iPhone screen uses more power than any other component. If brightness is at 100 percent all day, your battery will drain much faster than if it is at 50 percent. The easiest fix is to turn on Auto-Brightness, which adjusts brightness based on the light in your environment. Go to Settings > Display & Brightness and toggle on Auto-Brightness. This setting is off by default on newer iPhones.
If you want to manually control brightness, swipe down from the top right corner to open Control Center and drag the brightness slider down. Most people find that 40 to 60 percent brightness is comfortable indoors and still saves significant battery. Outdoors in bright sunlight, you may need higher brightness, but Auto-Brightness handles this automatically.
You can also reduce battery drain by switching to Dark Mode if you have an iPhone with an OLED screen (iPhone 12 and newer). OLED screens use less power to display dark colors because they turn off pixels entirely instead of lighting them. Go to Settings > Display & Brightness and select Dark. This will not help much on older iPhones with LCD screens, but on newer models it can add an hour or two of battery life.
When your battery is physically worn out
iPhones have rechargeable lithium batteries that degrade over time. Every time you charge your phone, the battery loses a tiny amount of capacity. After 500 full charge cycles, most iPhone batteries drop to about 80 percent of their original capacity. After 1,000 cycles, they may be at 60 percent. A charge cycle is a full drain from 100 percent to 0 percent, or the equivalent spread across multiple partial charges.
If your Maximum Capacity is below 80 percent, your battery is degraded. You can still use your phone normally, but it will not hold a charge as long as it did when new. The only permanent fix is to replace the battery. Apple charges between $69 and $99 for an out-of-warranty battery replacement depending on your iPhone model. Some third-party repair shops charge less, but Apple's replacement comes with a warranty.
If your Maximum Capacity is very low — below 50 percent — your iPhone may also show a message saying "Your battery health is significantly degraded" and may shut down unexpectedly even when the battery percentage shows 20 or 30 percent. This is a safety feature to prevent damage. In this case, battery replacement is the only solution.
Power-saving settings that actually work
Low Power Mode reduces performance and background activity to extend battery life. When you turn it on, your iPhone limits CPU speed, reduces animation smoothness, and turns off some features like mail fetch and automatic downloads. Go to Settings > Battery and turn on Low Power Mode, or swipe up from the bottom and tap the battery icon in Control Center. Low Power Mode typically adds 1 to 3 hours of battery life depending on how much you use your phone.
You can also set your iPhone to turn on Low Power Mode automatically when your battery reaches a certain level. Go to Settings > Battery and tap Low Power Mode, then choose "At 20%" or "At 10%". This way you do not have to remember to turn it on manually.
Another useful setting is Optimized Battery Charging, which slows down battery aging by limiting how much your battery charges overnight. Go to Settings > Battery > Battery Health & Charging and turn on Optimized Battery Charging. Your iPhone will learn when you usually charge it and will hold the charge at 80 percent until you need to use your phone, then finish charging to 100 percent. This reduces the total number of charge cycles your battery goes through.
Apps that drain battery the fastest
Social media apps like Facebook, Instagram, and TikTok drain battery quickly because they play video automatically, refresh feeds constantly, and track your location. If these apps are at the top of your battery usage list, try closing them when you are not actively using them, or uninstall them and use the web versions instead.
Navigation apps like Google Maps and Apple Maps drain battery because they use GPS constantly and keep your screen on. If you use navigation for long drives, plug your phone into a car charger. If you are using navigation for walking, try to use it only when you need directions rather than keeping it open the entire time.
Streaming apps like YouTube, Netflix, and Spotify drain battery because they play video or audio continuously. Streaming video uses more battery than streaming audio. If you are watching video on battery power, lower your brightness and use headphones instead of the speaker to save 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 lower battery percentage in winter than it would at the same charge level in summer. The battery is not actually draining faster; it is just delivering power less efficiently. Warm your phone up indoors and the percentage will usually go back up. Cold does not permanently damage the battery, but charging your phone in very cold temperatures can.
Does closing apps in the background actually save battery?
No. Closing apps by swiping them away in the app switcher does not save battery because they are not actually running in the background. Your iPhone automatically suspends apps you are not using. The only way to save battery is to turn off background app refresh for specific apps or to uninstall apps you do not use.
Should I turn off WiFi and Bluetooth to save battery?
Turning off WiFi and Bluetooth saves a small amount of battery, but the savings are usually less than 5 percent. If you are in a place with poor cell signal, leaving WiFi on actually saves battery because your phone does not have to work as hard to maintain a cellular connection. Only turn off WiFi and Bluetooth if you are in an emergency and need every bit of battery life.
Can I use a third-party battery replacement instead of going to Apple?
Yes, but there are trade-offs. Third-party repairs are often cheaper, but the battery quality may be lower and you will not have Apple's warranty. If something goes wrong with a third-party battery, Apple will not replace it for free. If cost is your main concern, compare prices at local repair shops in your area before deciding.
Does leaving my phone plugged in overnight damage the battery?
No. Modern iPhones have Optimized Battery Charging, which stops charging at 80 percent overnight and finishes charging to 100 percent in the morning when you need to use it. This reduces wear on the battery. If you turn off Optimized Battery Charging, your phone will charge to 100 percent and stay there all night, which does cause slightly more wear, but the damage is minimal.