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, a setting that keeps your screen or radios active when you don't need them, or a battery that has straightforward worn out after years of charging cycles. The fastest way to find out which one is happening is to check your battery usage report in Settings, which shows you exactly which apps have used power in the last 24 hours or the last 10 days.
Most people find the culprit is a single app—often one that tracks location, plays music, or refreshes content constantly. Sometimes it's a setting like location services left on for apps that don't need it, or Bluetooth searching for devices even when you're not using it. Occasionally the battery itself has degraded and can no longer hold a full charge, which happens to every lithium battery after 500 to 1,000 charge cycles.
Key Takeaways
- Check Settings > Battery to see which apps used the most power in the last 24 hours or 10 days, which usually identifies the problem when ready.
- Location services, background app refresh, and Bluetooth drain battery even when you're not actively using those features, and you can turn them off per app.
- If your iPhone is more than three years old and drains even after closing all apps, the battery itself may have degraded and may need replacement.
- Screen brightness, video playback, and gaming drain battery fastest, so lowering brightness or using low-power mode extends your time between charges.
- A single app left running in the background—especially maps, music, or social media—can drain 20 to 40 percent of your battery in a few hours.
How to check which apps are using your battery
Open Settings, then tap Battery. You will see a list of apps ranked by how much battery they used. The percentages shown are relative to total battery use, so if Maps shows 35 percent, it used 35 percent of all the power your phone consumed since the last full charge.
Tap the clock icon next to "Battery" to switch between "Last 24 Hours" and "Last 10 Days." The 10-day view shows patterns—if the same app appears at the top every single day, that app is the problem. If different apps rotate to the top, you may have a settings issue instead.
Look for apps you don't recognize or apps that should not be using much power. Maps, music apps, and social media apps naturally use a lot. But if your email app or a game you played once is in the top five, that's a sign something is running when it shouldn't be.
Turn off location services for apps that don't need it
Location services is one of the fastest battery drains because it keeps your phone's GPS radio active. Many apps request location permission but don't actually need it constantly. Go to Settings > Privacy > Location Services and scroll through the list. For each app, tap it and choose "Never" or "While Using" instead of "Always."
Apps like weather, maps, and ride-sharing genuinely need location while you're using them. But your email app, your notes app, and most games do not need to know where you are. Switching them to "While Using" means they can access your location only when the app is open on your screen.
If an app shows "Always" and you don't recognize why it needs that, change it to "Never" and see if the app still works. Most apps will function fine without constant location access, and your battery will improve noticeably within a day or two.
Disable background app refresh and Bluetooth when you don't need them
Background App Refresh lets apps check for new content even when you're not looking at them. This is useful for email and messaging but wasteful for games and news apps. Go to Settings > General > Background App Refresh, tap it, and toggle off the apps you don't need to update constantly. Or turn off the whole feature and toggle it back on only for apps that matter to you.
Bluetooth drains battery because your phone constantly searches for and maintains connections to wireless devices. If you're not using wireless headphones, a smartwatch, or a car system, turn Bluetooth off entirely. Go to Settings > Bluetooth and toggle it off. Turn it back on only when you need it.
The same logic applies to Wi-Fi. If you're away from home and not connected to a network, turn Wi-Fi off so your phone stops scanning for networks. Go to Settings > Wi-Fi and toggle it off.
Lower your screen brightness and use low-power mode
Your screen is the single biggest battery consumer on most iPhones. Lowering brightness extends battery life significantly. Go to Settings > Display & Brightness and drag the brightness slider down, or enable Auto-Brightness so the screen adjusts to the light around you.
Low Power Mode reduces performance and background activity to stretch battery life. Go to Settings > Battery and toggle on Low Power Mode. Your phone will limit app refresh, reduce animation, and cap processor speed. You'll notice the phone feels slightly slower, but battery drain drops by 15 to 25 percent. You can turn it off anytime.
If you're draining battery in just a few hours even with these changes, and your iPhone is older than three years, the battery itself may have degraded. Apple's battery health tool can tell you the condition. Go to Settings > Battery > Battery Health & Charging and look at the "Maximum Capacity" percentage. If it's below 80 percent, the battery is aging and may need replacement.
Check for iOS updates and restart your phone
Sometimes a bug in your current iOS version causes a single app or system process to run constantly. Go to Settings > General > Software Update and install any available update. Restart your phone afterward by holding the side button and either volume button, then sliding to power off.
A restart clears temporary files and stops any app that's stuck in a loop. After restarting, check your battery usage again in Settings > Battery. If the drain has improved, the problem was likely a temporary glitch. If the same app still appears at the top, that app is the source.
When to replace your iPhone battery
If you've turned off location services, disabled background refresh, lowered brightness, and your battery still drains in a few hours, the battery itself is likely worn out. This happens naturally after 500 to 1,000 full charge cycles—roughly two to three years of normal use.
Check the battery health by going to Settings > Battery > Battery Health & Charging. If "Maximum Capacity" is below 80 percent and you've owned the phone for more than two years, battery replacement is usually the answer. Apple offers battery replacement at Apple Stores and authorized repair shops. The cost varies by model but typically ranges from $50 to $70.
If your phone is still under warranty or you have AppleCare+, battery replacement may be covered. Contact Apple Support or visit an Apple Store to check your coverage.
Frequently Asked Questions
Can a single app really drain 30 percent of my battery in a few hours?
Yes. Apps that use GPS constantly, play video, or refresh content in the background can drain 20 to 40 percent in a few hours. Maps with navigation, music streaming apps, and social media apps that auto-play video are common culprits. Check Settings > Battery to see which app is at the top of your list.
Does closing apps in the app switcher help battery life?
Not much. Closing apps does not stop them from using battery if they're not running in the background. The real drain comes from apps that are actively running, which you can see in Settings > Battery. Focus on turning off location services and background refresh instead.
Will turning on low-power mode slow down my phone noticeably?
You may notice slightly slower animations and app launches, but most everyday tasks feel the same. Low-power mode reduces processor speed and background activity, not the speed of apps you're actively using. You can turn it off anytime if you need full performance.
Is it normal for battery to drain faster in cold weather?
Yes. Lithium batteries work less efficiently in cold temperatures, so your battery percentage may drop faster and your phone may even shut down temporarily if it gets very cold. The battery is not damaged—it will work normally again once it warms up.
What's the difference between battery percentage and battery health?
Battery percentage is how much charge is left right now. Battery health is the maximum amount of charge the battery can hold compared to when it was new. A phone at 50 percent charge but 85 percent health will drain normally. A phone at 100 percent charge but 60 percent health will drain much faster because the battery is worn out.