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How to Improve my Garmin Instinct Tactical Battery Life
If you are charging your Instinct 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.
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 Instinct Watch
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Note: You can enable night vision or stealth mode on your Instinct Tactical to improve battery life; however, some features will be disable when using these modes. In night vision mode, the heart rate sensor of the watch will be disabled. In stealth mode, your watch will not record or share GPS position and wireless features will be disabled. For more information, see - null or null
If battery drain still continues after making some settings changes, try returning the watch to factory defaults and seeing how long the battery lasts 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.