Garmin most likely is using lithium based battery. Such battery is recommended to be not fully charged and left like that for long period…. timed1 over 1 year ago +1. What Mr Z said is correct but I will add my version (more detailed). It all comes down to how many years do you plan to keep the watch, if you usually keep it for 4-5 years

Quick update: Garmin customer services don't do battery replacements but did, as predicted, offer me a refurbished replacement. But it's £155. Which makes a replacement, newer, device look like a more interesting option. It's a bit of an oversight, in my opinion, not to offer an affordable battery replacement service.
Perform 5-10 start jumps to get your heart rate up & commence the pairing process. You may be required to follow the pairing steps for each sensor after battery replacement as per user manual instruction. Related Support Link – Replacing the Battery on the Garmin HRM-Dual Fully Compatible with Fenix 5X Running Fenix 5X ; Battery Specifications : 410mAh, 3.8V, 1.56Wh ; Li-Polymer Type Battery. 500 times of impulse discharge ; Certificated with ISO9001, RoHS, CE, UN38.3, and MSDS ; Full Refund or a Free Replacement without Reason for 60 Days Battery capacity might degrade after 300-500 cycles, even more, some say 700-800. For the sake of argument, lets say 400 cycles. Divide 400 by 24, and you get 16 years of charging watch every 2 weeks. If it serves you this well 16 years, you can be happy :) So there is no reason to worry. Welcome to Garmin family.
361-00034-02, FLPB342735-P1 Battery Replacement for Garmin Fenix 3 and Fenix 3 HR Fitness GPS Smartwatch with Installation Tools. * Replacement for the Following Garmin Battery Model/Part Numbers : 361-00034-02, FLPB342735-P1, WX30.
I kept my Fenix 5 more than 4 years and resold with a battery life still good. I've owned a 6 two years and the battery was still lasting as brand new. Now with a 7 that I count to keep for years. You shouldn't worry too much about battery replacement. On smartwatches you recharge it daily or anyhow at least couple of times a week.
MPF Products 300mAh 361-00034-02, FLPB342735-P1 Battery Replacement Compatible with Garmin Fenix 3 and Fenix 3 HR Fitness GPS Smartwatch with Installation Tools 2.9 out of 5 stars 21 $15.95 $ 15 . 95
Replacement Watch Bands for Garmin fēnix 3 HR | Garmin Customer Support. FREE GROUND SHIPPING ON ORDERS $25 AND UP. Garmin Support Center is where you will find answers to frequently asked questions and resources to help with all of your Garmin products.
Buy Garmin 010-02159-00 fenix 6S, Premium Multisport GPS Watch, Smaller-Sized, Heat and Altitude Adjusted V02 Max, Pulse Ox Sensors and Training Load Focus, White: Running GPS Units - Amazon.com FREE DELIVERY possible on eligible purchases
Here are some solutions to help you maximize your Garmin watch’s battery life: – Update the watch’s software using Garmin Express. – Perform a quick soft reset by holding the Light Button for 30 seconds, then charging the watch to 100%. – Adjust the settings to optimize battery usage (e.g., reduce backlight intensity, change
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  • garmin fenix 3 hr battery replacement