feels like this is a let-me-google-that-for-you scenario:
Find out more about the battery life of Apple Watch. Learn about charge time, power reserve, and other battery metrics, too.
www.apple.com
here, I've copied the specific part so you don't have to do too much work:
Workout
Up to 11 hours indoor workout
Up to 7 hours outdoor workout with GPS
Up to 6 hours outdoor workout with GPS and LTE
The Apple Watch just isn't a fitness watch. yes it can track activities, but an actual fitness watch like Garmin, Coros, Suunto, Polar...all offer days if not weeks of a charge AND gps tracking for long runs/bike workouts. Yes, I'm on the extreme side, but 8 million Americans identify as trail runners like I do - not an insignificant amount. trail running is inherently slower and thus takes longer than road running. then there's longer distance bike riders going for 5 hours or more. And people who go for an all day hike, and...there's a lot of people who conceivably could use a watch for more than 7 hours of GPS per day (assuming it's brand new and lot suffering battery capacity loss within a half a year) and don't want to have to recharge it along with the annoyance that brings.
There's nothing wrong with the Apple Watch for what it is - a lifestyle watch. it can do a lot of amazing things. nobody disputes that. and it can track for up to 7 hours using GPS. Great. but buyer beware, you'll be charging it a lot more than you might think initially. Feel like we can have an honest discussion about what the watch is and what it's meant for.
Apple insists on bright colorful displays, thin form factor, and lots of built in options - all of which affect battery life.
If someone wants a watch with a battery that's going to last more than a day - simply put: the Apple Watch isn't for you.