I second this. If battery life and fitness features are of the upmost importance, check out a Garmin, Polar, Suunto, or something similar. They can last for many days on a single charge using GPS regularly and the only charging I do is when I'm showering, meaning I can track my sleep. I've had a Garmin 735XT for three years and it's not showing signs of age. It's less of a smartwatch and more of a fitness tracker, since the extent of "smart" features these watches often possess is limited to receiving notifications and possibly playing music, but I don't use these features anyway. I used an Apple Watch in the past, but much prefer a simpler fitness tracker. The only thing I miss is the ability to listen to podcasts using only a watch and Bluetooth earbuds.