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You should look at garmin. My 7x goes for weeks with all data collection on and the screen is clear enough to see without the back light when there is enough ambient light.
Unless I am recording tons of workouts, I don’t have to charge the battery but every few weeks. I sometimes plug it in when I take a shower so I don’t have to worry about it.
One word, garmin. Garmin has its own special charger but it’s designed for ruggedneas and there are several adapters on the market that let you charge it with usbc. My 7x goes for 3+weeks with spo2 turned on and does everything else a normal smartwatch does like notifications, quick replies, music, etc.