I'm having the same problem with the battery not holding a charge. Goes dead immediately after unplugging from a full 100% charge.

My Fenix 5s watch says 96% to 100% when plugged in. Then when I unplug it, it states "critical battery Powering off." Then it turns off. I plug back in, then it states 96%. Unplug it and again it goes dead with the "Critical Battery" code.
It all started about a week ago when I noticed the time was incorrect on my watch. Then it would crash when I tried to start an activity. Now the battery won't hold a charge. Do I need to send in for service?

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Garmin - Chris over 2 years ago +1 verified

Even though the Fenix 5 series has been out 5.5 years, if your watch model is one of the most common sold versions, we might still have your watch available in an recertified rebuilt form. In exchange for…

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0 thr4 over 2 years ago

How old is it? With Fenix 5 being five years old it's natural batteries will be reaching end of life, especially if the device was charged more frequently.

+1 Garmin - Chris over 2 years ago

Even though the Fenix 5 series has been out 5.5 years, if your watch model is one of the most common sold versions, we might still have your watch available in an recertified rebuilt form. In exchange for your watch, the recertified watch will average around ~$130 to $180ish but could be a little bit more if a titanium model. If you haven't already, please reach out to Outdoor Product Support in your region to learn more.