I have now some more realistic numbers. I did a reset last week on Monday and then charged it up to 100%. Lowest setting for the screen, always connected to the mobile and some 4 hours activity with Stryd Pod and Polar H10 Some notifications, always on HR & O2 sensor, sleep tracking and the usual stuff. Sleep mode from 10pm to 6am.
Today now, after exact 9 days I still have 37% battery life. That’s very OK for me as this will result in 14 days with activity and nearly all features except always on display.
I had a Fenix 8 47mm before and the latest firmware there gave me some 9-10 days estimation after charging, but in real life with activities it dropped to about 7-8 days
If now some of the already posted bugs (mainly the BT issue with powermeters on stopping, Wahoo Kickr Speed is not shown/recorded, sometimes HR lock and drops with wrist sensor) are fixed, I am VERY happy