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Hi @SunsetRunner - in addition to what @Clove6060 says make sure to uninstall the SpO2 tracker app. They both can use upto 4 days.
Here's the full list if things to check How to resolve the Major issues causing short battery life
You can also try turning off Bluetooth for a day and see if it makes a difference.
Is it possible that there is water damage? If this started happening from one day to the next without doing any update, it could be a possible cause.
Author | ch, passion for improvement.