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How to Improve the fenix 6S and fenix 6 Battery Life
If you are charging your fenix 6S or fenix 6 more frequently than expected, it could be due to the amount of usage or settings being used. Below is a list of functions that could cause the battery to drain faster than anticipated.
For instructions on enabling or disabling these settings, visit the Customizing Your Device section in the owner's manual.
Using Power Manager to Improve Battery Life
The fenix 6 series brings new features that allow for quickly controlling your watch’s battery usage. The Power Manager, featuring Battery Saver and Power Modes, allows you to customize and save key settings that affect battery consumption to improve battery life. If you are looking to get the most out of your watch's battery, start by looking into the Power Manager. To learn more about Power Manager, see - Understanding the fenix 6 Series Power Manager.
NOTE: It is important that before you address some of the functions that affected battery life, that you first make sure your watch is up to date: How to Install Software Updates to My fenix 6 or 6S Watch
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Some of the functions are redundant, for example; steps and activities are uploaded both through WiFi and the Bluetooth connection to the Garmin Connect Mobile application. If using the Garmin Connect Mobile app continuously, it may be a good idea to turn off the Auto Upload setting to help conserve battery power. The Storm Alert function of the Barometer when a smartphone updates local weather is another redundant battery drain.
If the battery drain still continues after making some settings changes, try returning the watch to factory defaults and seeing how long the battery lasts on a full charge without pairing it to the smartphone again. If the battery lasts like it used to, then the battery drain would be the result of the choice of customized settings on the watch, or Bluetooth connected features.