Have the watch just 1 week.
My setup:
NO notifications
NO music
NO pay
NO always on display
All other set to minimum
Standard watch face
1 hour/day GPS
1 Indoor activity 1 hr/day
When PulseOx off: max 4 days battery life (not even used as smart watch as you can see from settings
PulsOx night: From fully charged to dead 12-14 hours
PulseOx day: From fully charged to dead in 6-8 hours
That's ridiculous for a watch of this price. As comparison: my Polar Vantage V Titan has 12 days battery life with all trackings on.
Contacted Garmin support in Malaysia - they have no idea about the watch, no help, no advises. Just: send the watch for battery check. But when PulseOx drains like this, it's not mainly the battery, it's a rubbish software/ hardware setup. The (Garmin official) shop in Malaysia refused to take the watch back. I once followed the Garmin service suggestion to send the watch (Fenix 5X Plus Titan, erratic heart rate). The watch was new and I got a used, refurbished watch back as replacement - that's more cheating than service.
Beside this, my Garmin Express connects to Mainland China. I just "escaped" from there and really don't like to be forced to connect to there. There is no Malaysia connection and I also can't choose a different connection as Garmin has a ridiculous regional policy.
All in all, absolutely disappointed with the watch. Anybody any ideas how to fix these issues?