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iPhone 15 Battery Drops After Shutdown or Overnight – Quick Fix
Stop battery drain while idle with proven fixes
Symptoms
- Battery drops 5–20% overnight
- Battery drains while idle
- Phone loses charge after shutdown
- Battery falls even in Low Power Mode
- Issue started after iOS 26 update
Common Causes
- Background tasks running overnight
- iOS 26 battery calibration bugs
- Location services active in background
- Apps refreshing overnight
- Weak signal draining battery
- Corrupted battery statistics
Quick Fixes
1. Restart the Device
Resets battery reporting and background processes.
2. Turn On Airplane Mode Overnight
Stops cellular and Wi-Fi drain.
3. Disable Background App Refresh
Settings → General → Background App Refresh → Off.
4. Turn Off Location Services for Most Apps
Settings → Privacy → Location Services → Set most apps to "While Using."
5. Update All Apps
App Store → Profile → Update All.
Advanced Solutions
1. Reset All Settings
Fixes corrupted battery and network preferences.
2. Update to Latest iOS
Later iOS 26 builds fix idle drain issues.
3. Check Battery Usage
Settings → Battery → Battery Usage by App. Identify apps draining power overnight.
4. Switch to LTE Instead of 5G
Weak 5G signal drains battery overnight.
FAQ
Why does my iPhone drain overnight?
Background tasks, weak signal, and location services are common causes.
Is overnight drain normal?
1–3% is normal. 10–20% indicates an issue.