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I definitely agree with you. Even my Garmin Phoenix 5x plus will last multiple days with GPS usage for Backcountry camping. Another factor I worry about is the durability of the screen. Although you should always travel with backup Maps nobody wants to lose their primary navigation tool because a touch screen is nicer than Sapphire glass displays. That said the Apple watch is a nicer experience than the Phoenix which…
> 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.)
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.