My phone went from 50% to 0% overnight... Phone is set to dark mode. Noticed that messages app is using 6% of battery, but not sure if that's the culprit
Has your phone been OK and just started doing this ? have you downloaded anything new which may have affected the stability of your battery.
Have you moved location which may have a weaker signal connection that maybe pushing the phone harder to maintain connection ?
Can you run a full cycle of use and then upload a picture of your battery stats showing all the apps using your battery.
Some generic troubleshooting tips are …
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.
Have you checked your battery usage? To do this, please head to Settings > Device care > Battery > Battery usage. Take a look at the apps list, and find the app that is using the most power. Now, clear the cache and data of this app. You can do this in Settings > Apps > 3 dot menu > Show system apps > Find the app and select it > Storage > Clear cache/Clear data. Hope this helps 🙂
Haven't tried all above yet - it's a brand new phone, so not much on it - apps were transferred across from iphone... Can't believe you need to run through all these troubleshooting steps in 2021 on a flagship/expensive phone