Open Settings
Tap Battery
Look for Battery usage or Battery health
Check if your phone shows Battery health directly
Use the phone dialer and enter the manufacturer diagnostic code if supported
Open the device diagnostics app if your phone has one
Use a trusted battery health app from the Play Store
Check battery capacity, charge cycles, and estimated health in the app
Use ADB or device logs if you are comfortable with advanced tools
Visit the manufacturer support app or service center if battery health is not shown in settings