It seems the battery is fine. and strap is fine. I have put the Garmin sensor onto another strap and it was still working. I am just getting to low of numbers for HRT. As i did a manual reading. (finger to neck pulse) and Garmin is way off.
I should be able to get zone 5 HRT over 190. Instead it doesnt go higher then 130 , when doing something intense.
I would like try to different brand of Sensor. However I really like using my old Garmin forerunner 405 which is old school. I was wondering if if Polar Sensor would work on an old school garmin device?