Hi @crimsoncrust How long does your Battery last? Have you cleared the cache partition lately which is advisable after updates. Procedure as follows:
Press the Power key to restart the device.
Are you using any optimisation techniques such as turning off certain connections such as Bluetooth or Wifi when they are not needed and putting apps which are not used a great deal into sleep Mode? You can also use a Power saving at certain times, some of these points explained in the article @xSteveuk posted. However some customers have adequate battery life with Adaptive Refresh Rate and WQHD+ turned on. The Always on Display does use some battery life and some social media apps, particularly Tiktok can drain the battery more. Some Members use Dark Mode though I am not a fan of this being constantly on myself , prefer a balance of battery life and the best experience.
Some more information here : https://www.guidingtech.com/fix-samsung-one-ui-battery-drain/
If you can post your battery stats that would also help. Go to Battery and Device Care-Battery. click on that and take screenshot.
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 .