The fastest ways to cut battery drain right now
The single biggest drain on most iPhones is the screen brightness and how long it stays on. Lowering brightness to 40 percent and setting auto-lock to 1 minute will cut battery use noticeably within hours. If you use your phone heavily, also turn off location services for apps that don't need it—go to Settings > Privacy > Location Services and switch off apps like social media, weather, and maps unless you actively use them for navigation.
Background app refresh is the second major culprit. Apps keep running and checking for updates even when you're not using them. Turn this off in Settings > General > Background App Refresh, then toggle it back on only for apps you actually need updates from—email, messaging, maps. Most people can turn it off entirely and check apps manually.
Bluetooth and Wi-Fi search also drain battery when they're on but not connected. Turn off Bluetooth in Control Center when you're not using wireless headphones or a car. Wi-Fi will search for networks even when you're not looking for one; if you're moving between locations, turn it off until you need it.
Key Takeaways
- Lower screen brightness to 40 percent and set auto-lock to 1 minute—these two changes alone extend battery life by several hours for most users.
- Turn off background app refresh in Settings > General > Background App Refresh, then turn it back on only for apps that need to send you notifications.
- Disable location services for apps that don't require it; most social media and weather apps drain battery constantly even when closed.
- Turn off Bluetooth and Wi-Fi when you're not actively using them, since they search for connections even when disconnected.
- Enable Low Power Mode in Settings > Battery to reduce performance and cut battery drain by 15 to 20 percent when you're below 20 percent charge.
How Low Power Mode works and when to turn it on
Low Power Mode reduces CPU speed, limits background activity, and dims animations to stretch battery life. It kicks in automatically at 20 percent charge on most iPhones, but you can turn it on manually at any level. Go to Settings > Battery > Low Power Mode and toggle it on.
When Low Power Mode is active, your phone will feel slightly slower—apps take a fraction longer to open, downloads are slower, and some visual effects disappear. For most daily tasks like texting, email, and browsing, the slowdown is barely noticeable. The battery extension is real: Low Power Mode typically adds 15 to 20 percent more runtime.
Turn it on when you're below 50 percent charge and won't be near a charger for several hours. If you're at 20 percent and need your phone to last until evening, Low Power Mode is the fastest way to make that happen. Turn it off once you charge back above 80 percent.
Which apps drain battery fastest and how to check
Go to Settings > Battery to see which apps used the most power in the last 24 hours or the last 10 days. The list shows both screen time (how long you actively used the app) and background activity (how much it ran when closed). If an app shows high background activity but low screen time, it's draining battery without you using it.
Social media apps, navigation apps, and fitness trackers are the usual culprits. Instagram, TikTok, and Facebook run constantly in the background and use location services even when closed. If you see an app using 10 percent or more of your battery with minimal screen time, either turn off its background refresh or delete it.
Check this list once a week. Battery drain patterns change as you install new apps or as apps update their behavior. An app that was fine last month may start draining heavily after an update.
Display settings that save the most battery
Screen brightness is the largest single battery drain on iPhones. Set it to 40 to 50 percent for indoor use and only raise it when you're outside in sunlight. Go to Settings > Display & Brightness and turn on Auto-Brightness so the phone adjusts automatically as you move between rooms.
If your iPhone has a ProMotion display (iPhone 13 Pro and newer), it refreshes at 120 Hz by default, which uses more battery. Go to Settings > Display & Brightness > Motion and toggle on "Standard" to lock it at 60 Hz. You won't notice the difference in everyday use, but battery life extends noticeably.
Set auto-lock to 1 minute so the screen turns off quickly when you're not touching it. Go to Settings > Display & Brightness > Auto-Lock and choose 1 minute. Every second the screen stays on drains battery; 1 minute is the fastest safe setting that doesn't lock too aggressively.
Network and connectivity settings that extend battery life
5G uses significantly more battery than 4G LTE because it requires more power to maintain the connection. If you don't need 5G speed for what you're doing, turn it off. Go to Settings > Cellular > Cellular Data Options > Voice & Data and choose LTE instead of 5G Auto or 5G On.
Bluetooth searching for devices drains battery even when nothing is connected. Turn it off in Control Center when you're not using wireless headphones, speakers, or a car connection. The same applies to Wi-Fi—if you're moving between locations and not actively using Wi-Fi, turn it off until you need it.
Location services run constantly in the background for some apps. Go to Settings > Privacy > Location Services and review each app. Switch apps to "While Using" instead of "Always" so they only use your location when you're actively in the app. For apps like social media that don't need location at all, turn it off.
Battery health and when to consider a replacement
Over time, iPhone batteries lose capacity. After 500 full charge cycles (roughly 2 to 3 years of normal use), most batteries drop to 80 percent of original capacity. You can check your battery's current health in Settings > Battery > Battery Health & Charging.
If your battery health is below 80 percent and you're draining from 100 to 0 in less than a full day of moderate use, the battery itself is the problem, not your settings. Apple will replace the battery for a fee that varies by model—typically $50 to $70. Third-party repair shops often charge less but may not use Apple parts.
Don't let your battery drain to 0 percent regularly. Charging from 20 to 80 percent extends battery lifespan compared to full drain cycles. If you use your phone heavily, charge it twice a day rather than letting it fully deplete once.
Frequently Asked Questions
Does closing apps in the background actually save battery?
No. Closing apps manually does almost nothing because iOS suspends apps automatically when you switch away. The only exception is apps that explicitly request background refresh permission—those you should disable in Settings > General > Background App Refresh instead of closing manually.
Will turning off notifications save battery?
Slightly, but not much. Notifications themselves use minimal power. The real drain comes from apps running in the background to generate those notifications. Turn off background app refresh for apps you don't need notifications from, rather than disabling notifications alone.
Does dark mode actually save battery on my iPhone?
Only on iPhones with OLED screens (iPhone 12 and newer). OLED pixels produce their own light, so black pixels use almost no power. On older iPhones with LCD screens, dark mode makes no difference to battery life. If you have an OLED iPhone, enabling dark mode in Settings > Display & Brightness does extend battery life slightly.
Is it bad to leave my iPhone plugged in overnight?
Modern iPhones are designed to handle overnight charging safely. Once the battery reaches 100 percent, the phone stops charging and switches to trickle power to maintain the charge. Overnight charging won't damage the battery, though charging to 80 percent and stopping there extends long-term battery lifespan slightly.
Why does my battery drain faster in cold weather?
Cold temperatures reduce chemical reaction speed inside the battery, so it delivers power more slowly and drains faster. This is temporary—the battery recovers when it warms up. Keep your phone in a pocket or bag when it's cold outside, and avoid using it in freezing temperatures for extended periods.