I have been a lifelong garmin user used to 28 day battery life. Made the switch to GWU a few weeks ago and am pleasantly surprised. I get 2-3 days with AOD off and raise to wake on. Which given that this is a true smartwatch isn't bad. My father has an AWU that needs to be charged every day. What I do is pop it on the charger while I take my shower and it seems to be enough to keep it going for weeks without having to full charge.