The closest I ever came was buying Fitbit watches which, while smarter than an analog wristwatch, are not as versatile as the ...
A good way to lengthen your smartwatch's battery life is to tailor which apps you allow to send notifications to your watch.
After the main release, Android's quarterly releases have gotten pretty confusing, and Google should really go back to ".1" releases.
Most smartwatches last a day or two between charging, but the Mobvoi TicWatch Atlas offers a unique dual display technology that more than doubles the battery life.