The latest 3.71 update didn't fix the issue with the wrong Body Battery Data in Garmin Connect with "older" watches like my Instinct 2x.
By the time I bought the ISM there certainly was no information that the ISM is just compatible with the latest set of watches.
It's a real shame - the ISM is a wonderful addition to Garmins lineup and exactly what I was wating for. The sleep data is considerably more consistent and accurate in my experience then the data from my Instinct 2x and it is really comfortable to wear.
Will there be a fix in the forseeable future?