Try Withings It lasts a week on battery, shows time mechanicaly, records hearbeat and usual accelerometer/sleep/wtv. Not as advanced as Garmin/others, but it

Try Withings It lasts a week on battery, shows time mechanicaly, records hearbeat and usual accelerometer/sleep/wtv. Not as advanced as Garmin/others, but its neater and simpler. The timepiece functionality lasts a month without charging. Here being a watch comes first, bells and whistles are secondary