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I have a Garmin Instinct 2 Solar. The Solar feature is more of a gimmick, unless youre out in the sun the whole day for weeks it doesnt really make a difference.

But it doesnt matter much, the battery lasts 3 weeks. Its a great watch if you like the old-style digital watch screens

Just a week? I have a USB smartwatch with a 1 year battery life, the Timex Data Link USB.

You can also use a "dumb" watch that has 10 years battery life.

Or that constantly charges with a solar face or mechanical motion.

You can get a Rolex

In my case it’s just a Citizen chronograph from eBay for $100.

A Casio 5610 also charges with sunlight. To me it is the ultimate watch.

Sure, but I was talking in the context of smart watches that have several health sensors.

Xiaomi mi band's 10 battery lasts a week with all the functions enabled at the most expensive setting