If your iPhone’s battery isn’t lasting as long as it used to after updating to iOS 27, a few settings could be contributing to the problem.
Some allow your phone to use cellular data in the background, while others keep the display or certain apps active longer than necessary.
You don’t need to disable everything to see an improvement. These eight settings are worth checking, particularly if you find yourself reaching for a charger before the day is over.
1. Turn off Connectivity Assist if your Wi-Fi is reliable
iOS 27 includes Connectivity Assist, a feature that uses cellular data to maintain your internet connection when Wi-Fi becomes weak or unreliable.
That can be helpful when you’re moving around a building with poor Wi-Fi coverage, but some users have reported increased battery drain while the feature is enabled.
To turn it off, go to Settings > Wi-Fi, scroll down, and disable Connectivity Assist.
If you regularly use unreliable Wi-Fi networks, you may prefer to leave it enabled. Otherwise, try switching it off for a few days and see whether your battery life improves.
2. Switch from 5G On to 5G Auto
Keeping your iPhone connected to 5G can use additional power, particularly when coverage is inconsistent.
Apple’s 5G Auto setting helps manage this by switching to LTE when faster 5G speeds aren’t providing a noticeable benefit. You can still use 5G when it’s useful without forcing your iPhone to remain on it.
Open Settings > Cellular > Cellular Data Options > Voice & Data, then select 5G Auto.
If you spend a lot of time in areas with poor 5G reception, you can also try LTE to see whether it improves battery life.
3. Stop unnecessary apps from tracking your location
Some apps continue accessing your location even when you’re not actively using them. Over time, frequent background location requests can contribute to battery consumption.
Go to Settings > Privacy & Security > Location Services and review the apps listed.
For shopping, social media, and other apps that don’t need your location continuously, change access to While Using the App or Never.
Keep location access enabled for services that genuinely need it, such as navigation apps and Find My.
4. Disable Raise to Wake
Raise to Wake automatically lights up your iPhone’s screen whenever you pick it up. That’s convenient, but it can also activate the display when you’re simply moving your phone around.
Open Settings > Display & Brightness and turn off Raise to Wake.
You can still wake your iPhone by tapping the screen or pressing the side button.
5. Hide the wallpaper on the Always-On Display
On iPhones that support Always-On Display, your Lock Screen remains partially visible even when the device is locked.
You don’t have to disable the feature completely to reduce its power consumption. Instead, go to Settings > Display & Brightness > Always On Display and turn off Show Wallpaper.
Your clock and other essential Lock Screen information can remain visible against a darker background.
For greater savings, you can turn off Always-On Display entirely.
6. Turn off hands-free Siri if you rarely use it
If you don’t regularly activate Siri by voice, you can disable the option that listens for its wake phrase.
Open Settings > Apple Intelligence & Siri > Talk to Siri and turn off the hands-free wake option, if available on your device.
You’ll still be able to activate Siri manually using the side button.
This is more of an optional adjustment than a guaranteed battery fix. Modern iPhones use dedicated low-power processing for wake-word detection, so the savings may be small.
7. Change how often Mail checks for messages
If you don’t need every email to arrive immediately, reducing how frequently your iPhone checks for new messages may help limit background activity.
Go to Settings > Apps > Mail > Mail Accounts > Fetch New Data, where available, and review the options for your accounts.
For accounts that support Fetch, you can choose Hourly or Manually instead of checking more frequently.
Keep in mind that changing these settings means new messages may take longer to appear. Push availability also depends on your email provider.
8. Keep iOS 27 updated
Battery problems aren’t always caused by your settings. Software bugs can sometimes lead to excessive background activity, and Apple regularly releases updates that address performance issues.
Check Settings > General > Software Update to see whether a newer version of iOS 27 is available.
You can also enable automatic updates so your iPhone receives future fixes.
If battery life suddenly drops after an update, give your iPhone some time to finish background processing before changing several settings at once.
You can check Settings > Battery to identify which apps or activities are using the most power.
