After my run on Saturday morning, I charged up the F5x+ and rebooted the device. I then took screenshots about every time I noticed the battery % had dropped. I left pulse ox on the "all day" setting, and was connected to my phone pretty much the entire time. The first night, my phone was much closer in range to the F5x+. Sunday night, it was across the house. It still connected, but that connection is pretty spotty and at the fringe of the Fenix's ability to maintain a connection.
My assessment is that battery life is pretty good all things considered. I'm confident that the software team will figure out the "post activity drain" issue that users seem to be experiencing on these forums.
For reference my F5x, sitting on my desk, but not being worn/used, dropped to 91% in the same time period. ciq.forums.garmin.com/.../1378901.jpg ciq.forums.garmin.com/.../1378927.jpg