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I want a watch that only needs to be charged once in a few days, because I want to wear it at night for it to track my sleep and wake me up and I could charge it while I shower (every 2 days, in case you're wondering).

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My wife does this with her Apple Watch and she only charges it while she’s in the shower and 15 mins or so before bed. It always lasts the full day. I was surprised when I learned this. So it might not be there for you yet. But it’s close.

I charge it for half an hour after my morning workout(while taking a shower and getting ready) and for 15 minutes once in the evening I sleep. I track both my sleep and workouts, and keep it wearing throughout the day otherwise.

While it might not be as 'smart' as some other ones out there. The Nokia/Withings Charge HR has sleep tracking, heart rate tracking, vibrates and does notifications too. The battery easily lasts a month sometimes longer.

It also looks like an actual adults watch too.

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