alt Hacker NewsIDK about Coros or Suunto, but the only Garmins with a battery life approaching 30 days cost ~$1,000. This could be competition for AWU, but wouldn't communicate that there is demand for a more basic/long-lasting Apple Watch.
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30 days is asking a lot of any reasonably sized smartwatch, but if you set your sights a bit lower then a $250 Coros Pace 4 will do ~3 weeks with AOD off, ~1 week with AOD on, and 30-40 hours of continuous GPS recording. That's still a lot longer than any Apple Watch even if it's not hitting the 30 day milestone.
Unlikely pebble to get 30days with garmin type usage either. A forerunner with mip display should survive for 2+ weeks though
I've got an Instinct Solar 2x and it does last 30 days for me, and it's much cheaper than $1000.
Smart watches with long battery life exist. Garmin watches generally have ~2 week battery life:
* Venu 3 for $350 has 2 week battery life [1]
* Forerunner 55 for $150 has 2 week battery life [2]
I don't see why you are defining success as 30 days of battery life when the baseline is charging your watch every day.
[1] https://www.garmin.com/en-US/p/873008/pn/010-02784-00/
[2] https://www.garmin.com/en-US/p/741137/