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