With a new operating system, many new functions come in - but also problems. Since the release of iOS 11 recently, many users report a lower battery life.
The short recharge time can have to do with the fact that they deal with energy-intensive new functions like the ARKit.
Turn off Bluetooth:
Some settings have also been changed. Who switches off WLAN and Bluetooth via the new control center disconnects only the active connections. If you want to switch off WLAN and Bluetooth correctly and save battery, you have to do this in the Settings app.
Consumption check:
If you want to conserve energy on the mobile phone, you should check your battery consumption. Under the menu item Battery you can see the details of the last 24 hours and the last 6 days. If you tap the clock, more accurate data will appear. So you can see at which points you can save battery.
Disable updates:
Also in the "Settings" under "General" you can see the background updates. Apps are constantly collecting data - even this sucks on the battery. If you do not need an app, you should also disable background updates.
Disable or close GPS:
In addition, the GPS can be switched off in order to save energy. Here, too, you can set for the individual apps, which of them in which situation the site may use.
Switch on power saving mode:
If all settings are checked and the battery still runs low, the last option is also the power saving mode. This limits certain functions that suck at the battery run time. The power saving mode can be found under Settings / Battery. If you need it more often, you can also add it to the control center settings.
In addition, Apple gives itself official tips to extend the battery life.