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Forerunner 945 Battery Life Issues
Battery life for a Forerunner® 945 watch can vary based on the watch's settings and use, but you should expect the amount of time between charges to be around the following guidelines:
Smartwatch Mode: Up to 2 weeks
GPS mode with music: Up to 10 hours
GPS mode without music: Up to 36 hours
For tips on reaching the maximum advertised battery life, see the following FAQ: Tips to Extend the Battery Life on a Garmin Fitness Watch.
I Have Tried the Tips Listed Above and I Am Still Having Short Battery Life
If you have followed the tips above and your watch continues to experience a battery life of less than three days in between charging, you can request an exchange using the following tool: Garmin's Online Exchange for the Forerunner 945 .
NOTE: The Garmin exchange tool is only available in select countries and an exchange fee may apply when submitting a request to replace your device. Refer to the drop-down list in the exchange link for details. Contact your local Garmin Product Support office for assistance if your country is not listed.