Update to the latest software.
Apple software updates often include advanced energy-saving technologies, so always make sure your device is using the latest version of iOS, macOS or watchOS.
Keep your device out of extreme temperatures.
Remove certain cases during charging.
Charging your device when it’s inside certain styles of cases may generate excess heat, which can affect battery capacity. If you notice that your device gets hot when you gauge it, take it out of its case first. For Apple Watch Edition models, make sure the cover of the magnetic charging case is off.
Optimize your settings.
There are two simple ways you can preserve battery life - no matter how you use your device:
Adjust your screen brightness and use Wi-Fi
Dim the screen or turn on Auto-Brightness to extend battery life.
To dim, open Control Center and drag the Brightness slider to the bottom
Auto-Brightness adjusts your screen to lighting conditions automatically. To activate it, go to Settings > General > Accessibility > Display Accommodations and set Auto-Brightness to On.
When you use your device to access data, a Wi-Fi connection uses less power than a cellular network - so keep Wi-Fi on at all times. To turn on Wi-Fi, go to Settings > Wi-Fi to access a Wi-Fi network.
View Battery Usage information.
With iOS, you can easily manage your device’s battery life, because you can see the proportion of your battery used by each app (unless the device is charging). To view your usage, go to Settings > Battery