To get the most life from your battery:
Use Battery Saver mode to keep going on a low battery.
Also, avoid these battery-intensive activities until you can charge:
To see if a specific app or service is draining your battery:
To ensure that apps use your battery only when they need to, keep adaptive battery and battery optimization on.
Check that adaptive battery is on for your phone
When you keep adaptive battery on, infrequently used apps will run less when you're not using them. Your phone will learn how you use apps over time and adjust for best battery life.
Check that battery optimization is on for each app
If you turn off Battery optimization for an app, that app can run when you're not using it, even when Adaptive Battery is on. This decreases battery life unnecessarily.
If an app is listed as Not optimized:
Touch Optimize > Done.