I have a fenix6s pro, just over a month old, it has a blinking red light underneath, what does that light mean.
PulseOx sensor working
And the battery when finished charging only lasts for 4 days.
Yes, PulseOx consumes a lot of energy. Turn it off, if not needed
And the battery when finished charging only lasts for 4 days.
Of course, because PulseOx is not on by default when you buy it. And that's for a reason.
Will there be any problems?
If you turn on features without reading the manual, and without knowing what to expect, then it is very probable that yes. But, anyway, you can bet that there will be some problems even without that