Select your product to confirm this information applies to you
How to Improve the Garmin fenix 5 Series Battery Life
If you are charging your Garmin fenix more frequent 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, visit the "Customizing Your Device" section in the owner's manual.
For instructions on enabled or disabling these settings, visit the "Customizing Your Device" section in the owner's manual
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 smart phone updates local weather is another redundant battery drain.
If 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 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.