Battery Drains While Shutdown

This same problem began for me several months ago and I also haven't been able to figure ANYTHING out to stop it.  Prior to that if I shutdown the Surface it would not drain the battery.  Now, Battery just drains away no matter what I do.  I have tried many or all things that have been suggested or I have read about.  It doesn't get hot or drain super fast, but I can't have it off for several days or a week or more without it eventually draining down to nothing.  It is interesting and probably an important symptom of this issue that when I run a sleepstudy it doesn't know what to do with the mysterious drain in battery when it comes back up.  It initially still reports the battery at the same level as last shutdown, but later just suddenly reports the new dropped battery level without any message as to why it dropped.

Thanks, hermantandela I did try that and fully charged it to 100% and shut it down fully at 1:00 am turned it on at 8 am and it was showing 82%

I had the same problem.. did some research online and found the solution (at least for me.. hope would work to others too)

So here's the solution... by disabling the Connected standby

Open run.. type regedit

HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Power

Click the "Power" folder.. look for "CsEnabled" and double click it

Change Value data to 0

Restart

I too now have this same problem.  It used to be fine until around December 2018.  I don't use the Surface Pro 4 regularly I use it when I'm going out and need a PC to support customers.  So its important that its charged when I need it.  I used to put it in hibernate and could pick it up and use it a few weeks later.  But now it is flat after 2 days.  Another issue which has appeared at around the same time is it doesn't always recognise the keyboard cover (I have 2 and neither are recognised so it is the Surface Pro 4)  There are hundreds of other users with this Keyboard problem as well if you look at other threads.  There was an update I did in December which flashed the internals with a firmware update.  I believe it is something to do with one of the internal microcontrollers that is draining the power and probably the same one that communicates with the cover keyboard and touchpad.  But there is no way for users to flash these.  Microsoft won't let you go back to an earlier version and I can't see any way of even verifying the code is valid.  Presume they are doing this for security, which is why they don't want to release a fix because it may put them in a bigger problem with security of the devices.

When it worked it was a nice device but I can't see me buying another Surface Pro.  Just bought a new iPad Pro 2018.  When I need to run PC apps I RDP to my desktop which has Wake on Lan

Jon

Same.  This is terrible! Cannot believe Microsoft is just flat out refusing to acknowledge this issue.  Soooooooo frustrating!!!!