If I read the original issue correctly, it's a battery drain when powered down? If that's the case, there was a fix for this...

START -> SETTINGS -> SYSTEM -> POWER & SLEEP -> ADDITIONAL POWER SETTINGS -> Choose what the power button does
Uncheck "Turn on fast startup"

After shutting down the laptop after this, drain significantly lessened (there was still a little, but less than 1% on most of the laptops we tested this on)

I generally recommend fully shutting down modern laptops to anyone I talk to as they are usually using SSDs anyway so the startup is comparable anyway.