Just for curiosity, I switched off wrist recognition, so the screen no longer switches on inadvertently (it was a bit annoying sometimes). As a consequence, battery life literally jumped. After 6 hours on my wrist, I'm at 97%, with normal usage, so battery is probably bound to last 3 full days. I have a 42mm SS, screen brightness set at maximum. Normally, I used to charge the watch at night with about 30-40% of battery life left after a typical day with notifications, some phone calls/texts, pulse recognition during a workout and some quick "demo" for friends. Does that action also toggle off infrared heart pulse recognition? I can't believe those huge savings come exclusively from screen not toggling on involuntarily.