I solved the battery problem with an ultra, but I couldn't solve what is consistently off heart rate monitoring.
It now feels almost unusual for it to get the heart rate correct. And I'm not talking about off by a few or feeling off. I'm talking about full on max heart rate when I'm doing a easy run or 1/2 and 1/3 off which is impossible to miss.
Try setting it a bit further back away from the wrist bones that stick up so that the sensors are in constant contact with the skin, and can illuminate the blood pulses in the vessels under the skin.
It now feels almost unusual for it to get the heart rate correct. And I'm not talking about off by a few or feeling off. I'm talking about full on max heart rate when I'm doing a easy run or 1/2 and 1/3 off which is impossible to miss.