Has anyone noticed their Apple watch battery draining 2 times faster after update 9.5.1?

yes , since the update there is a problem for sure

my wife's watch and my sons watch are all experiencing the same thing.

One of my posts was removed, not sure why. But apparently there are very strict rules here on what we are allowed to say.

I believe there is a software problem, and I hope apple will address it

I have been wearing my watch for 1hour this morning and already down to 83% battery.

this only started happening as of the recent software update.

The software problem is most probably in your iphone.

If you don't want to go through all the options presented many times above (ok so you didn't read any of it) then do this

Apple Watch battery drain - the ultimate … - Apple Community