> Even my Garmin Phoenix 5x plus will last multiple days with GPS usage for Backcountry camping.
Sporadic GPS usage, I'm guessing, since Garmin themselves only claim 13 hours of GPU usage (can't tell if it has UltraTrac though - the 5x non-plus can do 50 hours in UltraTrac mode.)
UltraTrac on my Fenix 5 is pretty useless though, you may as well not be recording at all at that point. I'm not sure if it's gotten better on the more recent watches, but the reported mileage would be off by 30%+ and the resulting map wouldn't even come close to resembling my actual path.
That said, even in normal GPS only mode (no Gallileo/GLONASS), the 5 when it was new would get 30 hours of recording. Enough for most ultras, 3 days of backpacking if you record 8 hours/day, and also enough for a week trip with an hour of running every day.
Sporadic GPS usage, I'm guessing, since Garmin themselves only claim 13 hours of GPU usage (can't tell if it has UltraTrac though - the 5x non-plus can do 50 hours in UltraTrac mode.)