The fastest ways to cut iPhone battery use right now

The single biggest drain on an iPhone battery is the screen brightness and how long it stays on. Lowering brightness to 30 to 40 percent and setting auto-lock to 1 minute will cut battery use noticeably within a day. After that, turn off location services for apps that do not need it, disable background app refresh for apps you do not use constantly, and switch off Bluetooth and Wi-Fi when you leave home. These four changes together typically extend battery life by a full day or more.

If your phone is already running hot or draining faster than it did last month, a specific app or setting is usually the culprit. The Battery section in Settings shows which apps have used the most power in the last 24 hours or the last 10 days. Start there: if one app is using 40 percent of your battery, that app is the problem, not your overall settings.

Key Takeaways

  • Lower screen brightness to 30 to 40 percent and set auto-lock to 1 minute — these two changes alone cut battery drain by roughly one-third.
  • Turn off location services for individual apps in Settings > Privacy > Location Services, keeping it on only for maps and navigation apps that genuinely need it.
  • Disable background app refresh in Settings > General > Background App Refresh for apps you do not check throughout the day.
  • Check Settings > Battery to see which apps used the most power in the last 24 hours, and uninstall or stop using any app that drains more than 10 percent of your daily battery.
  • Enable Low Power Mode in Settings > Battery to reduce performance and cut battery drain by 15 to 20 percent when you are below 20 percent charge.

Adjust screen brightness and auto-lock timing

Your screen is the largest power consumer on the phone. Every minute the screen is on, it draws power. Brightness makes it worse: a screen at full brightness uses roughly twice the power of a screen at 40 percent brightness.

Open Settings > Display & Brightness. Turn off "Auto-Brightness" if it is on, then manually set brightness to 30 to 40 percent. This feels dim at first, but your eyes adjust within a few minutes. If you work outdoors or in bright sunlight, keep auto-brightness on instead — it will raise brightness only when needed.

Next, set auto-lock to 1 minute. Go to Settings > Display & Brightness > Auto-Lock and select 1 Minute. This means your screen turns off one minute after you stop touching it. If you set it to 2 or 5 minutes, the screen stays lit while you are reading or thinking, burning battery the whole time.

Turn off location services for apps that do not need it

Location services use GPS, which is a constant power drain. Many apps request location permission but do not actually need it — social media apps, news apps, and games often ask for location but work fine without it.

Go to Settings > Privacy > Location Services. You will see a list of every app that has requested location access. Tap each app and choose "Never" unless the app genuinely needs to know where you are. Maps, navigation, and weather apps should stay on. Social media, games, and shopping apps should be set to "Never." Apps like Reminders and Notes can be set to "While Using" if you want location-based reminders, but "Never" is the safest choice for battery life.

Location services also includes system services like "Significant Locations" and "Location-Based Alerts." Scroll to the bottom of the Location Services screen and tap "System Services." Turn off "Significant Locations" — this feature tracks everywhere you go and uses constant GPS. Leave "Emergency SOS" on.

Disable background app refresh for apps you rarely use

Background app refresh lets apps check for new messages, updates, or data even when you are not using them. This is useful for messaging apps and email, but wasteful for apps you check once a week.

Go to Settings > General > Background App Refresh. You will see a toggle at the top to turn it off entirely, or you can scroll down and turn it off for individual apps. Keep it on for Messages, Mail, and any app you check multiple times a day. Turn it off for news apps, shopping apps, social media you do not check constantly, and games.

If you turn off background app refresh entirely, your phone will not fetch new messages until you open the app. Most people find this acceptable — the trade-off is that you might not see a notification for a message that arrived 10 minutes ago, but you will see it as soon as you open the app.

Turn off Bluetooth and Wi-Fi when you leave home

Bluetooth and Wi-Fi both search for networks and devices constantly, even when you are not actively using them. If you are away from home or the office, turning them off saves battery.

Swipe down from the top-right corner of your screen to open Control Center. Tap the Bluetooth icon to turn it off, then tap the Wi-Fi icon. When you get home or to the office, swipe down again and turn them back on. Alternatively, go to Settings > Bluetooth and Settings > Wi-Fi to toggle them off.

If you use AirPods or a car that connects via Bluetooth, you may want to leave Bluetooth on. In that case, at least turn off Wi-Fi when you leave home — Wi-Fi searching uses less power than Bluetooth, but turning it off still helps.

Enable Low Power Mode for extended battery life

Low Power Mode reduces performance and visual effects to cut battery drain by 15 to 20 percent. Your phone will feel slightly slower, but it will last much longer.

Go to Settings > Battery and turn on "Low Power Mode." Your phone will automatically enable it when you reach 20 percent battery, but you can turn it on manually at any charge level. When Low Power Mode is on, a yellow battery icon appears at the top of the screen. Low Power Mode disables background app refresh, reduces email fetch frequency, and lowers screen refresh rate — all of which save power without affecting basic phone use.

You can also set Low Power Mode to turn on automatically at a specific battery percentage. In Settings > Battery, tap "Low Power Mode" and choose when you want it to set up.

Check which apps are draining your battery

If your battery drains faster than it should, one app is usually responsible. Go to Settings > Battery to see a breakdown of battery use by app over the last 24 hours or the last 10 days.

Tap "Battery Usage by App" to see the full list. If one app is using more than 10 to 15 percent of your daily battery, that app is the problem. Common culprits are social media apps that refresh constantly, games that run in the background, and navigation apps left running after a trip. If an app is draining too much battery, you have three options: uninstall it, stop using it, or check if the app has a battery-saving setting in its own preferences.

Sometimes a system app like "System Services" or "Cellular" shows high battery use. This usually means your phone is searching for signal in an area with poor coverage, or a background process is stuck. Restart your phone — hold the power button and slide to power off, wait 10 seconds, then power it back on. If battery drain does not improve after a restart, the phone may have a hardware issue and should be checked by Apple.

Frequently Asked Questions

Does turning off Wi-Fi and Bluetooth really save battery?

Yes, but the savings are modest — usually 5 to 10 percent per day if you leave them on constantly. Turning them off when you leave home helps, but screen brightness and app background activity have a much larger effect. If you use AirPods or a car connection, the inconvenience of turning Bluetooth on and off may not be worth the small battery gain.

Will Low Power Mode slow down my phone?

Yes, noticeably. Apps open slightly slower, scrolling is less smooth, and some visual effects are disabled. For most people, the trade-off is worth it — your phone will last 15 to 20 percent longer. You can turn it off anytime if you need full speed.

What if my battery drains even with all these settings changed?

Check Settings > Battery to see which app is using the most power. If one app is using more than 20 percent of your battery, uninstall it or stop using it. If no single app stands out and battery drain is new, restart your phone. If the problem continues, your battery may be degraded and need replacement — Apple can test this at an Apple Store or authorized repair shop.

Should I keep my phone plugged in overnight?

Modern iPhones stop charging at 100 percent and do not overcharge, so leaving it plugged in overnight is safe. However, keeping a battery at 100 percent constantly does degrade it slightly over years. If you want to extend battery lifespan, charge to 80 percent and unplug. For daily use, overnight charging is fine.

Does closing apps in the background save battery?

No. Closing apps manually does not save battery — iOS already suspends apps you are not using. Disabling background app refresh in Settings is what actually stops apps from using power in the background. Closing apps manually is unnecessary and does not help.