Conversely, I have stopped wearing other watches because I believe my rather rudimentary smartwatch has made them obsolete. The device in question is a Fitbit

Conversely, I have stopped wearing other watches because I believe my rather rudimentary smartwatch has made them obsolete. The device in question is a Fitbit fitness tracker. The killer feature regarding the battery is the ratio of life to charging time, viz that I can wear it all day and all night (gaining sleep tracking and, best of all, a silent vibrating alarm) and keep the battery topped up in the duration of a daily shower. Not 24/7, but 23.6/7 easily.