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Forerunner 165 and 165 Music Battery Life Assumptions
The battery life of your Garmin watch may be affected by how you use the watch. The information in the tables below is presented to help outline the conditions used to determine the estimated 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® 165 and Forerunner® 165 Music smartwatches.
The following usage assumptions were used to determine the estimated battery life. Unless otherwise stated, all default software settings and configurations are assumed for battery life specifications.
| Notifications per Day | 50 |
| Number of Interactions per Day | 32 |
| Device-Generated Alerts per Day (Move or Goal Alerts) | 2 |
| Hours per Day Outside of Bluetooth Range of Phone | 1 |
| Display Brightness and Timeout | Default Settings |
| Watch Face1 | Default |
| Number of Gestures per Day | 750 |
| Average Number of Hours per Day Spent Outside | 5 |
| Pulse Ox Mode | Disabled by Default |
| Number of Minutes of Streaming Music | 0 |
| Number of Timed Activities | 0 |
| Battery Life | Up to 11 Days |
| Average Number of Hours per Day Spent Outside2 | 5 |
| Watch Face | Default |
| Average Number of Hours per Day Sleep3 | 8 |
| Display Timeout | Always on |
| Battery Life | Up to 4 Days |
| Number of Interactions per Hour | 10 |
| Minutes of Interaction Post-Activity | 1 |
| Number of Gestures per Hour | 25 |
| Display Brightness & Timeout | Default Settings |
| Assumed Temperature Range for Battery Life Specifications | 10C-40C |
| GPS-Only Mode without Music Battery Life | Up to 19 Hours |
| All Systems (Default) Mode without Music Battery Life | Up to 17 Hours |
| GPS-Only Mode with Music Battery Life (165 Music Only)4 | Up to 7 Hours |
| All Systems (Default) Mode with Music Battery Life (165 Music Only)4 | Up to 6.5 Hours |
Battery Saver Feature
The Forerunner 165 and Forerunner 165 Music also support a feature called Battery Saver. Enabling this feature changes the behavior of the watch and disables certain functionality (see table below for some examples) to help prolong battery life. The table below summarizes the estimated battery life when Battery Saver is enabled.
| Phone Connection | Disabled |
| Number of Interactions per Day | 32 |
| Device-Generated Alerts per Day (Move or Goal Alerts) | 2 |
| Display Brightness & Timeout | Low/Short |
| Watch Face | Low Power Watch Face |
| Number of Gestures per Day | Gesture Mode Disabled |
| Pulse Ox Mode | Disabled |
| Wi-Fi Usage (165 Music Only) | Disabled |
| Music Playback Through Bluetooth Headphones (165 Music Only) | Disabled |
| Number of Timed Activities | 0 |
| Auto Activity Start | Disabled |
| Wrist Heart Rate | Disabled |
| Battery Life - Smartwatch Mode | Up to 20 Days |
1The “default” watch face is the watch face present on the device when it is taken out of the box. The Forerunner 165 and Forerunner 165 Music 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.
2 This device utilizes an ambient light sensor to automatically adjust the display brightness to an acceptable level depending upon the level of ambient light. Using the device outdoors in bright environments may reduce battery life.
3 The average number of hours per day of sleep is determined by the user-configured bed and wake times (a "sleep period"), not the number of hours the user actually sleeps. During this sleep period, the device's display is turned off. As a result, setting a shorter sleep period may decrease the battery life experienced in display always on mode.
4Estimated battery life may be affected by the encoded music format or music service provider.