Sorry for the irony, posted same thing in Vivosmart forum without replies...
The body battery is not syncing between my Forerunner 945 and Vimosmart 4, how is this possible?
I had a Vivomove HR and bought precisely the VS4 for the Body battery feature, what's the point of all the Physio TrueUp stuff then??
Here the Body battery "stimated" (green) for the period of the 5K i did this morning, rest comes from VS4.