surface book battery drain while shut down

I'm having this problem too.  I shut down my Surface Book for 24 hours and Battery 2 (the tablet battery) drops about 15%.  This is with the Surface Book completely shut down, it was NOT in sleep mode, and NOT in Hibernate, it was completely shut down.  15% per day when completely turned off is a ridiculous amount of battery drain.

I later did a test with Hibernate, and it has the same battery drain.

I have all of the latest updates installed.

Could this be a driver or firmware issue?  Or is this a hardware issue, like a bad run of batteries?  It seems like hardware to me, not sure how they could fix this with a firmware update, but maybe.

I usually leave my Surface Book plugged in and in Hibernate.  So does this mean that my battery is quickly draining all of the time, and constantly charging back up?  What kind of further damage is that doing to the battery?

$1800 is hard to swallow with this kind of issue.

I've just go mine and the battery was completely dead when I first tried to power up, I knew something was wrong right away since most of the time laptops come with at least 30% or more of battery charge, for a moment I thought it was DOA , anyways I'm experiencing the same battery issues as many people are, I really like it so I'm giving MS 'til the end of my return window to fix this problem which I shouldn't , I paid good money for a product that should be flawless period.

After having this happen a few days ago, I did a test last night.  This is not normally what I would do but it's a first test.  I was using it as a laptop only, and plugged in the whole time, never detached the screen.  At the end with the charge at 100% I shut down and unplugged it.  Six hours later I started it up and it was still at 100% and I shut down again.  In the AM about 15 hours later they were still at 100%.

My normal use is to use it on battery at night end of day I usually detach and reverse the screen and then use it in tablet mode to watch twitch for a few hours.  I then shut down in tablet mode, and after shut down, I will detach and switch the screen around the right way and close the lid.

I will see if I notice any draining again using it normally as a laptop only on battery power for half the day, Then I will test using in tablet mode while connected to base and do a normal shutdown without a screen flip, then test doing a screen flip. If it doesn't happen again, I will be stumped.

I did mess with the power setting, removing sleep from the shutdown options, and making the power button and do a shut down.  I also disabled fast startup.

I did not have this "battery drain while shut down" problem when I first got the Surface Book (16 GB 512 GB i7). It started happening for the last couple of days. So I'm suspecting it might be the new updates? This is one of the zillion problems I'm having with this laptop. But it is unbelievable how a laptop can drain while it is shut down -no not the lid being closed, or sleep etc. a complete "shut down."

This happens to me too.  I always do a shut down when done using the device because of all I have heard about the sleep problems.  I left it shut down in the basement after using about 40% total power and when I went down to get it about a day, day and half later the batteries were at 0%.

I'm very much looking forward to what the January update will do for battery life and in particular "sleep"..  I too power-down at night and definitely power down before putting mine in my commuter bag.  I've not experienced much more than normal battery drain of just a few percent while turned off.  

I will admit though that I'm a very heavy user and this is my main computer.  It powers up in the morning as soon as I'm awake and it powers down just before I go to bed, seven days a week.  It will really be nice to have "sleep" work like it should and not to have to remember to always power-down.