Two days is so poor for a ultra watch. The fact it won't last a full weekend let alone any significant hike just means it doesn't fit the market it is aiming at.
3 days is a complete joke. Competitors have battery lives measured in weeks rather than days (a famous, and still 100% appropriate, quote by Garmin. Now 5 years old and counting, and the situation is still as ridiculously bad).
Seriously what is it even doing to justify going through the battery so fast? Are they just bad at programming?