I got the Watch 5 a few weeks ago and it has great battery life during the day, but I find at night it can lose 50% to 70% of its charge. I put it into bedtime mode but it doesn't seem to help. Oxygen sensor is turned off and heart rate is set to every 10 minutes. My previous watch, which was the first iteration of the Watch, lasted way longer.
Is there anything else I can do?
Hi, please Open Wearable app >> Account and backup >> Backup data
Now, you can click General >> Reset. After reset your watch, you can restore watch data from backup.
Monitor your watch if battery still drain fast or not.
I did as you said and gave it a few days but the battery is still draining overnight. I'm wondering if it has something to do with the fact that I turn my phone off at night.
Try leaving your phone on for a night or 2 and see if it makes a difference
Quite possible your watch is searching for your phone to connect and running down the battery