@zimma71 Which device do you have? Are you using any optimisation techniques , ie. for instance do you use a Power Saving Mode for any periods, do you have any apps in sleep Mode? Generally recommended for apps which are not used a great deal. It is best to turn off connections such as Wifi,Bluetooth and GPS when they are not required.
some other ideas also in this article, though may not wish to utilise all of them for the best experience Personally I am not a fan of Dark Mode during the day. https://www.androidpolice.com/how-to-extend-your-samsung-phones-battery-life/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .
Can you charge the phone to 💯 % again and use it as normal until your battery reaches around 15% and then go into Device Care and Battery section and screenshot that page with also using the scroll capture option to show all apps and include your top status bar on thenphobe and add that screenshot here so we can see what's going on.
Also check that your battery optimisation settings are what they should be.
If I can be of any further help then please don't hesitate. Take care. 😎
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "