What if I told you that I
just replaced by SB on Monday?!
I had a defective keyboard (down arrow key) so my replacement arrived Monday, restored my system, then shipped out my defective unit on Tuesday.
We had to stop troubleshooting, by the way, because nothing was working. She attempted to escalate on the call, but her support told her to have me disconnect my external monitors. Whatever and, sure enough, nothing changed.
I disables non-MS services and startup apps and Antivirus and absolutely no change whatsoever. At this point, what else can I do but give up?!
Have you tried disabling services/startup top see if you're still losing that much battery when you power off?