Kieran has said that a permanent solution is going to be in the next firmware update, but as far as we know, said update has been delayed by Insyde while we wait for upstream fixes to some big issues. Unclear what the timeline will be on that.
I believe that a fairly easy workaround for this problem could be to, after shutdown, power the laptop on again and when the display turns on, press the power button again to turn it off. Doing this, I’ve observed zero battery drain after a day or so (though I have not actually confirmed that I do have the battery drain when doing just a regular shutdown, so I did not do a full comparison).
I suspect that doing this makes the BIOS or EC trigger a poweroff, which maybe powers things down more completely than the OS does (as instructed by the ACPI tables from the BIOS).
If you’re having the drain problem, maybe try this approach and let us know if it works for you?
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Will try this, I’ll get back in about 3 days to see if this works.
Nope, did not work for me at least 
Guys, have you tested the battery drain on the complete shutdown with BIOS 3.09?
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I edited the first post to point to the 3.09 BIOS release (currently in Beta, but on track to be taken out of Beta within the next couple of weeks). 3.09 resolves the issue discussed in this thread about battery drain while shut down.
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Thanks for testing it!
Datapoint: 21h with no battery percentage change reported by Windows. I know this is shorter than discussed in this thread but I actually use my laptops sometimes 
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