@AllyLS: How long have you had the Galaxy Watch 4? If it has been less than 2 weeks, then please be aware that there will be a period whereby the watch learns your usage patterns, and optimises the battery accordingly. Therefore, with this in mind, you should expect to see an improvement in the battery life over time.
If this isn't applicable, then please charge the Watch 4 to 100%, use it as you would normally until it reaches around 30%, then head to the Galaxy Wearable app > Watch settings > Battery, and check the breakdown to see if any apps or features are using a high amount of battery. I also recommend taking a look at the steps below in a n effort to improve your overall battery life.
- Make sure the device is on the latest software via Settings > Software Update, or on the Galaxy Wearables app via Watch Settings > Watch Software Update
- Disable Watch Always On, if applicable, via Settings > Display > Watch Always On.
- Disable Wi-Fi and Bluetooth when not in use
- Disable unused health features, such as the Heart Rate Tracker, by heading to Samsung Health > Settings > Measurement > Manual Only
- During periods of downtime, head to Settings > Battery > Watch Only > Turn On.
@AllyLS Battery life will improve if certain connnections/functions are only used when necessary. There may be an issue with particular apps as @AndrewL explained. Do you have many other than the pre installed ones? You may wish to consider a Power Saving Mode on occasions and Static watch faces will also consume less Battery .
some other information in this article https://wearablestouse.com/blog/2022/04/11/save-battery-samsung-galaxy-watch-4/
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 .