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Battery Life Information
The actual battery life depends on the features enabled on your watch, such as activity tracking, wrist-based
heart rate, phone notifications, GPS, and connected sensors.
Mode Forerunner 255S series
Battery Life
Forerunner 255 series
Battery Life
Activity mode with GPS Only mode and wrist-
based heart rate Up to 26 hr. Up to 30 hr.
Activity mode with All Systems mode and wrist-
based heart rate Up to 20 hr. Up to 25 hr.
Activity mode with All Systems mode, wrist-based
heart rate, and music playback Up to 5.5 hr. Up to 6.5 hr.
Activity mode with All + Multi-Band mode and
wrist-based heart rate Up to 13 hr. Up to 16 hr.
Smartwatch mode with activity tracking, phone
notifications, and wrist-based heart rate Up to 12 days Up to 14 days
Troubleshooting
Product Updates
Your device automatically checks for updates when connected to Bluetooth or Wi‑Fi. You can manually check
for updates from the system settings (System Settings, page86). On your computer, install Garmin Express
(www.garmin.com/express). On your phone, install the Garmin Connect app.
This provides easy access to these services for Garmin devices:
Software updates
Data uploads to Garmin Connect
Product registration
Setting Up Garmin Express
1Connect the device to your computer using a USBcable.
2Go to www.garmin.com/express.
3Follow the on-screen instructions.
Getting More Information
Go to support.garmin.com for additional manuals, articles, and software updates.
Go to buy.garmin.com, or contact your Garmin dealer for information about optional accessories and
replacement parts.
Go to www.garmin.com/ataccuracy.
This is not a medical device. The pulse oximeter feature is not available in all countries.
Activity Tracking
For more information about activity tracking accuracy, go to garmin.com/ataccuracy.
My daily step count does not appear
The daily step count is reset every night at midnight.
If dashes appear instead of your step count, allow the device to acquire satellite signals and set the time
automatically.
Troubleshooting 91
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