Fix iPhone Battery Draining Fast on AT&T After iOS 18 Update

After updating to iOS 18, some AT&T iPhone users have reported faster battery drain than usual. This issue is typically caused by system reindexing, background processes, or new iOS features syncing data in the background. Here’s how to fix it and extend your battery life effectively.

Step 1: Check Battery Usage

Go to Settings > Battery to see which apps are consuming the most power. Apps that use background activity or location services may drain the battery faster after an update.

Step 2: Disable Background App Refresh

Navigate to Settings > General > Background App Refresh and turn it off completely, or limit it to Wi-Fi only. This prevents apps from constantly updating in the background.

Step 3: Adjust Location Services

Go to Settings > Privacy & Security > Location Services and set most apps to While Using the App. Disable unnecessary location access for apps you rarely use to conserve battery life.

Step 4: Enable Low Power Mode

Turn on Low Power Mode from Settings > Battery or via Control Center. This temporarily limits background tasks and visual effects to reduce energy use.

Step 5: Update All Apps

Outdated apps may not be optimized for iOS 18. Open the App Store, go to your profile icon, and tap Update All to ensure compatibility and improved performance.

Step 6: Reset Network Settings

Sometimes battery drain on AT&T networks is caused by unstable signal switching. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings to refresh your cellular configuration. This often helps with carrier-related energy drain.

Step 7: Optimize Battery Health

Learn more about maintaining long-term battery health and charging habits in our guide: Battery & Power Management.

Step 8: Improve System Stability

Performance bugs can also increase battery drain. Visit Performance & System Optimization for additional fixes that stabilize background processes and extend battery efficiency.

For a complete collection of iPhone-related guides, visit the iPhone Hub.

OnePlus Tip

After a major iOS update, keep your iPhone connected to Wi-Fi and a charger overnight. iOS reindexes system files and photos in the background, which can temporarily increase power usage. This process usually stabilizes within 24–48 hours.

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