The Ultra 2 is going to last at least as long as the original. And, for me, the battery simply isn’t a concern.
When I jump in the shower, I put it on the charger; at that point, it’s basically at 50% ±10%. When I get out of the shower, it’s at 85% ± 5%. I have zero battery-babying strategies employed; the always-on display is on, I wear it overnight, etc., etc., etc.
My personal worst-case scenario for time between charging would be an intercontinental flight — for example, Phoenix to Tokyo (or vice-versa). And I’d be just fine following my normal routine: charge it before going to bed in Phoenix, wear it through multiple airports, flights, trains, busses, etc., to wherever we’re spending the first night in Tokyo (including using it to navigate, pay for the train with Suica, etc.), and only then putting it on the charger before getting into the shower. It’ll need longer than normal to charge at that point, of course … but I’m going to be taking my own sweet time in the shower, as well. (My iPhone 13 mini … will have needed to be topped off at least once.)
I’m not the type to go for an extended trip away from an electrical outlet, but I have absolute confidence that I could easily get at least a few days out of the watch for such, and probably manage an entire week if I knew ahead of time that I had to. To be sure, I’d be powering it off overnight, that sort of thing.
The short version … worrying about charging the battery on the Ultra is about on a par with worrying about having a change of underwear. If you’re not worried about the latter, you shouldn’t be worried about the former.
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