Heart Rate Difference Between Charge 4 and Versa 4

[EdorphinAddict]

I replaced my Charge 4 with a Versa 4 and noticed that there is a huge difference in my heart rate while exercising.  For example, when wearing the Charge 4 on the Stairstepper,my heart rate would run up to the 150 bpm range on the difficult parts of the canned routine I use.  With the Versa 4, I barely make it into the 100 bpm range using the same routine at the same settings.  Is there a calibration that needs to be done?

[Guy_]

Hi @EdorphinAddict - this is because the Versa 4 has difficulty registering a Heart rate when moving repetitively, some under read and others over read, whereas older devices produced a more accurate result.

[Triletics]

The only calibration that will fix the problem is going back to Charge 4🤷