That's sounds like a poor battery life, I get around 4 days with GPS 1 hour a day, SpO2, cEDA and AFib notifications turned on. And I have the 'always on' feature of my screen turned off. How are your settings?
Best Answer@WKA82 Agree with @RonaldM. You need to specify how you use your watch. This is extremely poor battery life. Make sure your always-on display isn't on. Believe me, it's easy to miss that. I did for a couple of hours before realising my screen wasn't turning off. Make sure this icon isn't on (it is on the picture to show which icon I'm talking about). I tapped it once just by missing the DND icon and haven't noticed turning it on at that moment.
This is the fastest battery drainer (although still, with always-on the watch should last longer than 24 hours). Otherwise, if it's not the case I'd suggest rebooting the device, seeing what's gonna happen and if you still have this problem returning the device as faulty. There is nothing that would drain your battery this fast and only if you used GPS throughout the day for many hours (5-6) that would make for this usage (GPS works only during activities).