absurd high HR, insane battery drain. completely disappointed

I am still on 20.29 and since tonight I have a huge battery drain (1,5%/hour) without any activity. I have read about blinking HR sensor and trying it to go to the rest mode b triggering and activity but it did not help. Yesterday prior I had m average battery drain about 0,4%/hour and I honestly am not sue what has changed. There was no software upgrade and I did not set the watches any differently. I have them for 2+ years so it's not like I am a newbie to them.

But who works on the 255 updates? Underpaid hamsters? One disaster after another. With the new update HR has been fixed but Battery drain is still there. Yes, I have already deactivated garmin share and done factory reset

did you made a factory reset? if not try, if this doesnt work, make a factory reset and delete all data, i just needed to do this 2 times until the watch appears to work fine again...bizarre..

battery worked fine afterwards or high HR or both? 

Yesterday I charge my 255 to 100% today I update to 20.31 and see that I have 80% power left. So in less then one day 20% drain with no activities done, no gps .... very strange ....

I charged to 80 percent yesterday, and had 1.5 hours of activity. Today the battery shows 77 percent, so your drain is definitely not normal.