A. Battery of your watch may be draining fast due to: 

1.This may occur if the number of screen wake-up times increases when you raise your wrist in special scenarios.

2.The power consumption of your watch may increase when you enable Auto heart rate monitoring.

3. The power consumption will increase if the screen brightness is at 100 %.

B. In order to reduce the battery consumption of your watch:

1. Disable Auto heart rate monitoring in the Noisefit app.

2. Disable Notifications in the NoiseFit app if you do not need the notification function.

3. Disable Raise wrist to wake screen in the NosieFit app if you do not need to use this function. You can do the same by Swiping up on the watch from the homescreen then go to settings and turn off Raise to wake up Function