I've had my 55 for about 18 months now and just today, a message popped up in the middle of my workout that said the Heart Rate Monitor Battery is Low. Whenever it would say that I checked to see if it was measuring my HR and it wasn't but there are not gaps in my data and it seems to be working fine now. I have never seen this before. I run with it almost every day and just want to make sure that I am using it correctly and whether or not to replace the battery.
Idk if this helps but
Do you have some reason to doubt the low battery life messages?
Whenever it would say that I checked to see if it was measuring my HR and it wasn't but there are not gaps in my data and it seems to be working fine now
1) How do you know it wasn't measuring your HR?
2) If you're sure it wasn't measuring your HR wouldn't that be a cause for concern?
3) How do you know there were no gaps in your (external HRM) data? Any possible gaps could've been filled in by the optical HR (unless you have that disabled.) Even if there were no gaps, that doesn't mean your HRM battery isn't low. I would expect to get a low battery alert before things start to fail, not afterwards.
As a side note, if you really want to see whether the HR for an activity came from optical HR, external HR or a combination of both:
- Open the activity in the Connect website
- Click on the gear icon (upper-right)
- Select Export File (a ZIP file will download)
- Open https://www.fitfileviewer.com/
- Click Open FIT and select the downloaded ZIP file
- Click on the Chart button
- Select the following two fields for y1 and y2: heart rate and wrist heart rate
"wrist heart rate" is obviously your wrist HR data (but only when the watch used it, iirc). "heart rate" is either wrist heart rate or external heart rate (whichever the device decided to use). You can tell by looking for the difference between those 2 graphs if your wrist hr ever kicked in (which would only happen if the external hr had gaps.
