Problem: it seems a lot of issues were encountered after your OS or security updates were installed or maybe some apps still running in the background or some unused features you turned on from the Quick Settings Panel if necessary for you.
Fix this battery issue:
1. optimize your phone 2. close background apps 3. manage your storage and uninstall unused apps 4. turn on Power Saving mode 5. turn off unused features (Bluetooth, NFC, Sync, Mobile Data, Location, Wi-Fi) if necessary 6. restart your phone every time if the performance is slower 7. Low the brightness
Or, to enter Recovery Mode, Power off your device, then press and hold the volume up and side key until the boot logo appears and automatically enters the recovery mode. Then wipe the cache partition to fix this issue and you can do it 2 times after installing OS or security updates. Before you enter recovery mode, make sure you connect your phone to your PC because Android implemented this feature for security reasons.
If none of these above didn't work, contact Samsung moderators for help (not me lol) for information
