How to fix Galaxy S9 battery life problems –
-Reduce screen display time : Reduce screen display time and set it 15 seconds / 30 seconds to quickly turn off display and save battery in galaxy S9 & S9 plus. Settings > Device > Display > Sleep > 15 seconds / 30 Seconds
-Uninstall (or disable) unused apps.
-Isloate apps draining the battery : Social media apps, in particular, tend to consume a lot of resources in the background, and to get an idea of how much power a particular app is consuming, head to System -> Device maintenance -> Battery.
-Configure the performance mode.
-Optimize optimize optimize : Settings -> Device maintenance.
-Set up battery saver : There are two modes to choose from — Mid and Max — and like most things in the interface, you can adjust the settings to configure just how aggressive each mode is.
-Start fresh and use Smart Switch.
– Factory reset galaxy S9 & S9 plus :
Step 1: Go to Settings in your galaxy S9 & S9 plus
Step 2: Tap on Backup & reset
Step 3: Tap on Factory data reset
Step 4: Tap on Reset Phone
Step 5: Tap on Erase everything