You can broadcast your heart rate data from your fēnix 3 device and view it on paired Garmin devices. For example, you can broadcast your heart rate data to an Edge ® device while cycling, or to a VIRB ® action camera during an activity. NOTE: Broadcasting heart rate data decreases battery life. 1 Hold UP.
The improved GPS tracking and longer battery life knocks the price up to $230 and out of our sub-200 budget range, but it’s nevertheless a step up in quality if you’re willing to let go of a
Garmin Fenix 6S/Pro – A smaller 42mm case with slightly lower battery life, adds music, Wi-Fi, maps; Garmin Fenix 6X – Bigger screen, slightly better battery, Fenix 6S heart rate accuracy.
there are a lot of threads about battery life and the problems around it. I own a Fenix 6 pro and was also facing huge battery drain (0.5/hr). Recently (a few days back) there was a new beta firmware (5.74) and a Garmin Connect update for Android. The combination of both now made my Fenix to have a battery drain of about 0.3-0.4/hr.

The Garmin Fenix series Fenix 3 January 5, 2015: Fenix 3 HR January 5 except for the display and battery life. The Fenix series continues to use a

The widget displays your current heart rate in beats per minute (bpm), your resting heart rate for today, and a graph of your heart rate. From the clock, select DOWN. Select START to view your average resting heart rate values for the last 7 days. Wrist-based Heart Rate.
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garmin fenix 3 hr battery life