There’s also a way you can save a good amount of battery life on your iPhone by turning off one feature "Background Refresh".
This feature allows apps to refresh their content in the background while you’re not using them.
How to turn off Background Refresh on iPhone:
Step 1:
Go to your iPhone’s Settings and tap on General.
Step 2:
Tap on Background Refresh.
Step 3:
Then press the toggle in front of the app.
Step 4:
If you’d like to turn it off entirely, then tap the Background Refresh option at the top and set it to Off.
Step 5:
You can select the WiFi option which will enable background refreshing only when you’re connected to a WiFi network.