Battery runs out very fast

[McQuack]

My Xperia XZ3 started to run out off battery for about 3 days ago. I haven't downloaded any new apps. And there are missing like 30% off the battery usage when I check that in settings. What can I do? 

[Strampke]

Test

settings-consuming apps

Turn off WiFi and Bluetooth scanning

switch on adaptive battery

Goto support.Sonymobile.com and read about battery care.

Use the support app on your phone and tap on battery.

Tap on 'are you experiencing problems with your battery' ,you can answer questions there which help you with your problem.