I was also surprised that Garmin didn't have a built-in watch face that displayed HR. I was used to this coming over from FitBit. There also aren't a lot of 3rd party watch faces that have this option. After searching high and low, this one is my favorite. It's Alpha by PlayItLoud. It did cost me $1, but totally worth it for the design and HR Garmin Fenix series are simply the best products out there for active people - Amazon Reviewer. First, there's the optical heart rate on the back of the watch. Unlike the raised heart rate monitor on the Fenix 3HR, this one is flush and more comfortable. The sensor is always on, and takes your heart rate every 1-2 seconds, 24 hours a day. Fenix 3 HR - Temperature and Baromerter not working. Carlos9llettoRicardo over 4 years ago. Dear All, I Have a Fenix 3 HR and the temperature and barometer sensors stopped working. It just don't measure anymore, but used to work (last time worked was in 18/11/17). Firmware Version: 5.40.0.0 Jul 22 em 15:13 I tried to restore defaults but didn't Bought a second hand fenix 3 about 3 months ago. It was a great deal (125 usd). It is my first fitness watch. Great battery life, good activity tracking, decent smart phone connectivity (notifications, weather forecast etc). I really like it to the extent that I don't remove it at all. Like the Forerunner 265, Fenix 7, Epix 2, and Forerunner 955, the Forerunner 965 has Garmin’s Elevate V4 sensor — the green light records heart rate, and the red light records blood oxygen Tips to Extend the Battery Life on a Garmin Fitness Watch | Garmin Customer Support. FREE GROUND SHIPPING ON ORDERS $25 AND UP. Garmin Support Center. Garmin Support Center is where you will find answers to frequently asked questions and resources to help with all of your Garmin products. The actual battery life depends on the features enabled on your device, such as activity tracking, wrist-based heart rate, smartphone notifications, GPS, and connected sensors. vívoactive® 4S Battery Life. vívoactive 4 Battery Life. Mode. Up to 7 days. Up to 8 days. Smartwatch mode with activity tracking and 24/7 wrist-based heart rate Garmin has two heart rate monitors to choose Battery Life. Garmin claims a full 20 hours for constant on GPS recording at 1-second intervals, I charged it to full and let it run until dead on GvddY.