I have a Garmin FR 945, keep most sensors on all the time. I used it on a 2-day, 25 mile hike while recording everything and using its navigation and maps to figure out where I was on the trail for a good chunk of it, about 11-12 hours of recording, and it still didnt hit low battery by the end of the next day.
Generally I charge it every night or every other night so I don't know how long it stacks up against its estimates, but with some activities sprinkled in I think it's fair to say that a "1 week" estimate is closer to "4-5 days" if you’re active, depending on how long you're actively recording activities for during that time. As a plain smart-watch without tracking an activity or listening to music, it's down about 10% at the end of the day on those sedentary days, so I think that’s pretty in line with its numbers
Generally I charge it every night or every other night so I don't know how long it stacks up against its estimates, but with some activities sprinkled in I think it's fair to say that a "1 week" estimate is closer to "4-5 days" if you’re active, depending on how long you're actively recording activities for during that time. As a plain smart-watch without tracking an activity or listening to music, it's down about 10% at the end of the day on those sedentary days, so I think that’s pretty in line with its numbers