How do I determine how much power is left on the battery?

The battery icon on your device screen displays the remaining level of power in the battery.

When the battery is low, you see this screen:


(Press any button to return to the Time screen.)

When the battery is too low, the screen may go blank.

Caution:
Charge your device at least once every 6 months when you are not using the device; long-term storage of the device with a low battery may degrade battery performance.

The operating time for the battery varies depending on the device settings you are using, as described in the tables here.

Note: The Light setting is Off in all of the estimates shown.

Continuous workout time left (approximate)

Battery icon	Operating time	Settings used
	ProSense 307: 8 to 16 hours ProSense 347/367: 18 to 36 hours	Update Frequency: Per Second Meas. HR setting: On
	ProSense 307: 10 to 20 hours ProSense 347/367: 21 to 42 hours	Update Frequency: Per Second or Wrist turn Meas. HR setting: On or Off
	ProSense 307: 12 to 24 hours ProSense 347/367: 25 to 50 hours	Update Frequency: Wrist turn Meas. HR setting: Off
	ProSense 307: 3 to 8 hours ProSense 347/367: 7 to 18 hours	Update Frequency: Per Second Meas. HR setting: On
	ProSense 307: 4 to 10 hours ProSense 347/367: 8 to 21 hours	Update Frequency: Per Second or Wrist turn Meas. HR setting: On or Off
	ProSense 307: 5 to 12 hours ProSense 347/367: 10 to 25 hours	Update Frequency: Wrist turn Meas. HR setting: Off
	ProSense 307: 1.5 to 3 hours ProSense 347/367: 3.5 to 7 hours	Update Frequency: Per Second Meas. HR setting: On
	ProSense 307: 2 to 4 hours ProSense 347/367: 4 to 8 hours	Update Frequency: Per Second or Wrist turn Meas. HR setting: On or Off
	ProSense 307: 2.5 to 5 hours ProSense 347/367: 5 to 10 hours	Update Frequency: Wrist turn Meas. HR setting: Off
	ProSense 307: 0 to 1.5 hours ProSense 347/367: 0 to 3.5 hours	Update Frequency: Per Second Meas. HR setting: On
	ProSense 307: 0 to 2 hours ProSense 347/367: 0 to 4 hours	Update Frequency: Per Second or Wrist turn Meas. HR setting: On or Off
	ProSense 307: 0 to 2.5 hours ProSense 347/367: 0 to 5 hours	Update Frequency: Wrist turn Meas. HR setting: Off

Continuous time display left; approximate

Setting	30 days	7 days	5 days
Daily Activity Tracking	Off	On (Meas. HR setting: Auto)	On (Meas. HR setting: Continuous)
Auto Sleep Mode	On	On	On
Auto Search	Off	Off	Off
Bluetooth	Off	On	On

Note: Operation time also varies depending on the operating environment's effects on GPS reception.

Related concepts
Battery Life
Related references
Solutions to Watch Charging Problems