The fastest ways to cut battery drain right now
The single biggest battery drain on most iPhones is the screen brightness. Lowering it to 40 percent or less cuts power use noticeably within hours. Go to Settings > Display & Brightness and turn on Auto-Brightness so the phone adjusts for light around you instead of staying at a fixed level.
The second drain is background app refresh — apps checking for updates even when you are not using them. Go to Settings > General > Background App Refresh and turn it off entirely, or turn it off for individual apps you do not need constant updates from. Mail, weather, and news apps are common culprits.
Location services drain battery because GPS is power-hungry. Go to Settings > Privacy > Location Services and turn it off for apps that do not truly need it — games, shopping apps, and social media rarely need your exact location. Maps and weather genuinely do.
Key Takeaways
- Lowering screen brightness to 40 percent or less and enabling Auto-Brightness cuts battery drain faster than any other single change.
- Turning off Background App Refresh in Settings > General stops apps from draining power when you are not using them.
- Location Services uses GPS constantly on some apps; turn it off for apps that do not need your exact location.
- Low Power Mode cuts performance slightly but extends battery life by one to three hours on most iPhones.
- Closing apps in the background does not save battery on modern iPhones; turning off background refresh is what matters.
When to turn on Low Power Mode and what it changes
Low Power Mode is a built-in setting that reduces performance to stretch battery life. On most iPhones, it extends the day by one to three hours depending on how much you use the phone. You can turn it on manually at any battery level by going to Settings > Battery > Low Power Mode, or set it to turn on automatically when the battery hits 20 percent.
Low Power Mode slows down the processor slightly, reduces animation speed, and limits background activity. You will notice the phone feels a bit slower when opening apps or scrolling, but the difference is small for most daily tasks like texting, email, and web browsing. Gaming and video editing will feel noticeably slower.
You can leave Low Power Mode on all day without harming the battery. It does not degrade the battery itself — it just uses less power while the phone is running. Many people turn it on at 50 percent battery to stretch the day without waiting until the phone warns them.
Turning off features you may not actually need
Bluetooth drains battery when it is on but not connected to anything. If you do not use wireless headphones, speakers, or a smartwatch, turn it off in Settings > Bluetooth. If you do use them, leave it on — the drain is minimal when actively connected.
Wi-Fi actually uses less power than cellular data, so leaving Wi-Fi on at home saves battery. Turn off Wi-Fi only when you are away from your home network and cannot connect.
5G uses more power than 4G LTE. If your phone supports 5G, go to Settings > Cellular > Cellular Data Options > Voice & Data and switch to LTE if you do not need the speed. The difference is noticeable on older iPhone models.
Notifications wake the screen and drain battery every time an app sends an alert. Go to Settings > Notifications and turn off notifications for apps you do not need constant alerts from. Social media, games, and shopping apps are safe to silence.
What actually does not save battery (and why people think it does)
Closing apps by swiping them away in the app switcher does not save battery on modern iPhones. iOS suspends apps automatically when you switch away from them, so they use almost no power sitting in the background. Closing them manually and reopening them later actually uses more power because the phone has to reload them from scratch.
Turning off vibration does save a tiny amount of battery, but the difference is so small most people will not notice it. The motor uses power, but far less than the screen or processor. Only turn off vibration if you are in a situation where you need every last percent.
Restarting your phone does not improve battery life. A restart clears the RAM temporarily, but it does not fix battery drain. If your battery life suddenly got much worse, a restart is worth trying to rule out a software glitch, but it is not a regular maintenance task.
Checking which apps are actually draining your battery
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 the percentage of total battery each app consumed. If an app you rarely use is high on the list, it is probably running in the background or using location services.
Tap on an app in the battery list to see whether it used power while on-screen or in the background. If a social media app shows high background usage, go to Settings > General > Background App Refresh, find that app, and turn it off. If a maps or weather app shows high usage, check Settings > Privacy > Location Services and change it to "While Using" instead of "Always."
Some apps genuinely need background activity — mail, messaging, and fitness apps need to run in the background to work properly. Others like games and shopping apps do not. Turning off background refresh for the second group usually makes a real difference.
Battery health and when to consider a replacement
Your iPhone battery degrades over time. After about 500 full charge cycles (roughly one to two years of normal use), the battery holds less charge than it did new. You can check the current health by going to Settings > Battery > Battery Health & Charging.
If the maximum capacity shows 80 percent or higher, the battery is still in good shape. Between 70 and 80 percent, you may notice the phone does not last quite as long as it used to, but it is still usable. Below 70 percent, consider having Apple replace the battery, which costs around $70 to $100 depending on the model. A new battery often makes the phone feel like new again.
Do not leave your iPhone plugged in overnight regularly, and do not let it sit at 0 percent for long periods. Both shorten battery lifespan. Charging to 80 percent and letting it drop to 20 percent before charging again is gentler on the battery than charging to 100 percent every time, though the difference is small for most people.
Frequently Asked Questions
Does airplane mode really save battery?
Yes, airplane mode turns off cellular, Wi-Fi, and Bluetooth all at once, so the phone uses significantly less power. Use it when you know you will not need calls or data for a few hours. If you are in an area with poor signal, airplane mode also saves battery because the phone stops constantly searching for a signal.
Should I turn off location services completely?
No — turn it off only for apps that do not need it. Maps, weather, and find-my-friends apps genuinely need location to work. Games and social media do not. Go to Settings > Privacy > Location Services and set each app individually to "Never," "While Using," or "Always" based on what it actually needs.
Does dark mode save battery on my iPhone?
Dark mode saves battery only on iPhones with OLED screens (iPhone 12 and newer). On older models with LCD screens, dark mode makes almost no difference. If you have a newer iPhone, turning on dark mode in Settings > Display & Brightness does reduce power use slightly, especially if you keep brightness high.
Why does my battery drain faster in cold weather?
Cold slows down the chemical reactions inside the battery, so it cannot deliver power as quickly. The phone may shut down at 20 percent battery even though the battery is not actually empty. Warm the phone up indoors and the battery percentage usually returns. Cold does not permanently damage the battery, but extreme cold (below freezing for hours) can.
Is it bad to use my phone while it is charging?
Using your phone while charging generates heat, which is slightly harder on the battery than charging while the phone is idle. The difference is small for occasional use. If you regularly use the phone heavily while charging, consider letting it charge without use to extend the battery lifespan slightly.