I had a Seiko watch for decades that needed a new battery every 5 years, and I still miss it. It never left my wrist except for battery replacements. The Casio mentioned above goes one better by using solar, so it would never have to leave my wrist - and it has a BLE connection to the phone. But it doesn't have enough sensors, like an accelerometer.

Withings smartwatches come do closest, and that's what I have now. Their standout feature is their 30 day recharge, but they still have a ways to go.

They are expensive, but worse they are fragile and no one will repair them in most countries, and the rechargeable battery means they will only live a few years. On top of that I'd like to see them add NFC, payment card and passkey integration, with better security so if they leave you wrist you have to re-authenticate or reset them. None of these things require much (if any) power. Also while the analogue time is great, interacting with the digital interface is clunky. A single button is not enough. The digital interface could be bigger, and could display more - like displaying the last few message.

So my take is while smartwatches are improving, they still have a ways to go. And that way is not the direction Apple appears to be taking, which seems to be to put a power hungry iPhone with a miniature screen on your wrist. I'm hoping the old watch manufacturers will come back with their robust very low power designs, with a few added sensors.

The Scanwatch Light seems to be very close to what I need. While they're priced reasonably for what they offer, they're crazy expensive for what I would need. I'm really not interested in fitness or sleep tracking these days anymore.

I'm also a bit scared of the many "charging issues" some people seem to have with them after a few months, but I guess every batch has a few bad devices so I could hopefully return it.

Thanks for the recommendation! I might try one soon.