Forerunner 955 v.15.19 causing increased battery drain

I also installed update 15.19 today. My battery behaves as before.
Cannot confirm any unusual battery usage

Try turning it off by long press and hold of Light button and see after that how it behaves. Mine is doing OK till I connect sensor or headphones. That causes drain later, but not like that.

very very fast draining here as well. Down to 78% in a day from 97%. 

Yesterday I have same battery drain issue with 15.19.

It was just in Smartwatch mode, but it suddenly drained a lot at noon.

So I forced it off then on, afterward it looks normal till now.

I got the watch 2 days ago, installed the update on the first day and the drain is crazy. 1,5%/h with a stock watchface, pulseox turned off. Is my unit broken?

Hi, probably not. Try long Light button press & hold (after every FW update) to turn it off and see if the battery improves/stabilizes after second or third charge.

Thanks, I'll try that

As a general rule, every time my watch is updated, I do a hard reboot in order to fix this battery draining problem that occurs after an update.

I have battery saver on, airplane mode, bluetooth off and my battery drained 65% to 26% with in one night.

There seems to be a problem with the airplane mode. Try to reset the watch (hold LIGHT for 15s) and do not use the airplane mode... Then let us know, if it helps.