[jacobkania]

I have a Garmin Instinct. When I don't have many workouts, it gives me 2-3 weeks of battery (including instant phone notifications over Bluetooth, constant heart rate, barometer, and step tracking)

I went on a 2 week trip to Europe and didnt even bring my charger -- lasted the whole time. I've had it for a year now and it's rock solid. It's been in the ocean with me, and been smashed into rocks on backpacking trips. Still in great shape.

I don't endorse many things very heavily but this thing is amazing. It's not sexy with it's black and white screen and small selection of watch faces... But it's so nice never needing to charge it, it's basically indestructible, and does everything you'd want a smart watch to do