Surface Pro 4 battery drain - does 19H2 fix it?

It is unlikely that 19H2 will impact this at all. Microsoft updated firmware for
SP4/5/6, SL2, etc. in August and the release notes mentioned "battery
performance". Everyone (myself included) is drawing a dotted line between this
firmware and issues that RECENTLY STARTED. Microsoft has remained totally silent
on this issue. That said, there are reports of SP4 battery drain overnight that
go way back, and those, too have not had responses from Microsoft other than to
pay for an out of warranty exchange.

Note that Microsoft usually pushes Surface firmware to the RELEASE PREVIEW ring
first.. Without announcing or documenting it.

Thank you, this was very informative. In that case how can I roll back the firmware? 

Microsoft support said it's not possible, but I'm not sure I believe them.

There is always a way.

It is unlikely that 19H2 will impact this at all. Microsoft updated firmware for
SP4/5/6, SL2, etc. in August and the release notes mentioned "battery
performance". Everyone (myself included) is drawing a dotted line between this
firmware and issues that RECENTLY STARTED. Microsoft has remained totally silent
on this issue. That said, there are reports of SP4 battery drain overnight that
go way back, and those, too have not had responses from Microsoft other than to
pay for an out of warranty exchange.

Note that Microsoft usually pushes Surface firmware to the RELEASE PREVIEW ring
first.. Without announcing or documenting it.

That makes a lot of sense. My Surface seems to charge and de-charge much faster for the past month and half. I was wondering if it was just my imagination...

there is no way to roll back the firmware.

Yes! Out of luck.

Even Insider Builds - battery drain when the machine is off.  I have a Surface Laptop for the Insider Builds and a Pro 3 for the RTM version and both machines will drain down to zero on their own in about a weeks time if the power cord is not attached.

This probably means that something is running even though the machine is "OFF" or something else.

I did send feedback on this but so has many, many, many others to no avail.

I loved my surface pro 4 so much up till now.

I expected better from Microsoft's flagship

I can say that across the board of all machines I have (Dell, Acer, iMac, MacBook Pro, iPad, iPhone, Chromebook, Android tablet, a few others I forgot) - the only machines I have that have a battery drain issue are the Surface machines.

No other machines loses power over any amount of time!

You can't fix bogus engineering.

Thing is, that it only started since the August firmware and windows update, before that, it was amazing!

4Hours screen on time using word and light browsing. 

Standby lasting for days.

Now I'm lucky if I can get 2 hours screen on, even with battery saver turned on.

Been going back and forth with Microsoft support on twitter, they've been utterly useless. Simply telling me to ask my questions on the support forums... FYI-Thats what this is...

This is a cue that the updates themselves are screwing everything up.  My Surface Laptop and Pro 3 both got real good battery life before any updates came across and went downhill from there.

I do believe that most updates (except security updates) are not needed and the problems that about 90% of the machines are 'user configuration' problems.  A lot of people don't know how to set it up properly because there is no documentation on the operating system itself.  Thus, people are using the "old tricks" used all the way back to windows XP which will not work.

For firmware updates, you cannot roll back and remove them in most cases.  Other updates you can by viewing the Update History on the Windows Update panel.

Microsoft is still working on the power issues and even if you could remove the old, new ones will take their place to probably make things worse.

As for 4 hour battery life for general use - you was supposed to get a few hours more than that.  So, your machine was a 'storm drain' from the start.  The Pro 3 gets about 6.5 hours (before updates).  About the same 4 hours after the updates like yours.

The Surface laptop - I don't measure it since it is using Insider Builds for which come across every couple of days now.  Nothing counts on it.