I've had massive battery problems with my SP4 over last few years (particularly when Shut Down) - draining while Shut Down, substandard battery life while unplugged in general, etc.
But since the last few updates, it seems to be getting much, much worse.
I have it set to "Sleep" when I shut the lid. I shut the lid at 1AM, and opened it at 11AM, and the battery was at 47 percent.
I ran Sleep Study - if I'm reading it right, it showed a ten percent drain in seven minutes of use. And, then, yes, a drop from 90 percent to 47 percent while in Hibernate.
I have no idea how to interpret the rest of the report, but from what I understand it should help me identify bad actors?
(Every time I have ever had to check drivers for anything, they have always been updated, BTW)