The battery life of your Forerunner® 255, Forerunner® 255 Music, Forerunner® 255S, and Forerunner® 255S Music watch may be affected by how you use the watch. The information in the tables below is intended to outline the conditions used to determine the battery life specifications. Usage beyond what is listed below may result in reduced battery life. The information presented below is a reference-only guide for general use of the Forerunner 255 products.
Forerunner 255 | Forerunner 255 Music Smartwatch - Default Display Configuration
| Notifications per Day | 90 |
| Number of Interactions per Day | 160 |
| Device-Generated Alerts per Day (Move or Goal Alerts) | 2 |
| Hours per Day Outside of Bluetooth Range of Phone | 1 |
| Display Brightness & Timeout | Default Settings |
| Watch Face1 | Default |
| Number of Gestures per Day | 200 |
| Pulse Ox Mode | Disabled by Default |
| Number of Minutes of Music Streaming | 0 |
| Number of Timed Activities | 0 |
| Battery Life | Up to 14 days |
Forerunner 255 | Forerunner 255 Music - Activity Mode
| Number of Interactions per Hour | 10 |
| Minutes of Interaction Post-Activity | 1 |
| Number of Gestures per Hour | 8 |
| Display Brightness & Timeout | Default Settings |
| Assumed Temperature Range for Battery Life Specifications | 10C – 40C |
| GPS-Only Mode without Music Battery Life | Up to 30 hours |
| All Systems (Default) Mode without Music Battery Life | Up to 25 hours |
| All Systems + Multi-Band Mode without Music Battery Life | Up to 16 hours |
| GPS-Only Mode with Music Battery Life (255 Music Only) | Up to 7 hours |
| All Systems (Default) Mode with Music Battery Life (255 Music Only) | Up to 6.5 hours |
| All Systems + Multi-Band Mode with Music Battery Life (255 Music Only) | Up to 6 hours |
| UltraTrac Mode without Music Battery Life | Up to 54 hours |
Forerunner 255S | Forerunner 255S Music Smartwatch - Default Display Configuration
| Notifications per Day | 90 |
| Number of Interactions per Day | 160 |
| Device-Generated Alerts per Day (Move or Goal Alerts) | 2 |
| Hours per Day Outside of Bluetooth Range of Phone | 1 |
| Display Brightness & Timeout | Default Settings |
| Watch Face1 | Default |
| Number of Gestures per Day | 200 |
| Pulse Ox Mode | Disabled by Default |
| Number of Minutes of Music Streaming | 0 |
| Number of Timed Activities | 0 |
| Battery Life | Up to 12 days |
Forerunner 255S | Forerunner 255S Music - Activity Mode
| Number of Interactions per Hour | 10 |
| Minutes of Interaction Post-Activity | 1 |
| Number of Gestures per Hour | 8 |
| Display Brightness & Timeout | Default Settings |
| Assumed Temperature Range for Battery Life Specifications | 10C – 40C |
| GPS-Only Mode without Music Battery Life | Up to 26 hours |
| All Systems (Default) Mode without Music Battery Life | Up to 20 hours |
| All Systems + Multi-Band Mode without Music Battery Life | Up to 13 hours |
| GPS-Only Mode with Music Battery Life (255S Music Only) | Up to 6 hours |
| All Systems (Default) Mode with Music Battery Life (255S Music Only) | Up to 5.5 hours |
| All Systems + Multi-Band Mode with Music Battery Life (255S Music Only) | Up to 5 hours |
| UltraTrac Mode without Music Battery Life | Up to 44 hours |
1 The “default” watch face is the watch face present on the device when it is taken out of the box. The Forerunner 255 products are designed to work with a variety of native watch faces as well as compatible Connect IQ watch faces. The usage of watch faces other than the default watch face may impact the battery life experienced in smartwatch mode.