Not sure anyone else has experience the same problem with HP ZBook 15U G4 where the battery drains 15-20 % overnight while in shutdown. I have done the following steps already maybe there is something else i can try.
1:Replaced battert with Oem part.
2: Updated bios to version 01.31 Rev.A - Released 8 Nov19.
3: Disable Fast startup.
4:Disabled CS in registery
5: Unticked the allow wake option in device manager Ïntel Management Engine.
6: Delete ACPI driver and reinstalled.
7: Reinstalled Wiindows OS and updated all driver again.