On devices with an OLED display (iPhone X, XS, XS Max, iPhone 11, and iPhone 12), Dark Mode can save quite a bit of battery life, so it's worth enabling:
- Open Settings
- Choose Display & Brightness
- Tap the "Dark" option
How to Turn on dark mode and turn brightness down
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Don't close apps using the App Switcher
Many battery life guides suggest quitting apps, but this doesn't save battery life and can in fact drain more battery.
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13 iPhone Battery Saving Tips to Extend Battery Life
How to improve iPhone battery life with low power mode, background app refresh, location services, and more settings