Surface Pro 4 battery drain while OFF

Thanks Victor_S

Another solution I've found is to shut down the computer the old way - regular shutdown instead of hybrid shutdown.

You can use this shortcut:

C:\Windows\System32\shutdown.exe /s /t 3 /c "Full Shutdown"

- shutdown.exe can execute the various sleed/hibernate commands, including the regular shutdown.

- /s means "shutdown". If we shutdown the normal way, it is a hybrid shutdown (/hybrid)

- /t 3 means after 3 seconds. If you skip this it's 30 seconds by default.

- /c "Full shutdown" is a simple comment that will appear in various places as the reason for your shutdown.

Keep in mind it takes a little longer to shutdown this way, and it takes a little longer to start afterwards, but I think the computer doesn't keep some systems active, thus you should see almost no battery drain, even for prolonged times.

That is a good question because the screen will be off.  Before shutting down and all programs are closed, you can do a CTRL+ALT+DEL and select the task manager and look at the processes that are still running at that moment and you may find 'something' but doubtful.

The power sub-system could also have a defect causing that as well and not actually shutting off the machine when it is supposed to be off.

The task manager may give you a clue when all programs are shut down.  If you can't find anything listed, it is possible you may need to contact customer support to get the machine swapped out.