I turned off the notifications for the Heart app, and my battery (so far) is now draining normally. There are three options for notifications--high pulse, low pulse, and irregular heart beat. It seems to me that the Heart app, as originally set up, is acting as a Holter monitor, and the average person does not need this level of heart tracking. However, if a user needs the watch to do such tracking, simply turn on the notifications and charge the watch as often as possible.