What does happen?
In sleep mode (InstantGo/Connected Standby), the battery drains at around 2% per hour. 2% per hour translates to around 1W of power consumption during standby.
What should happen?
Per Microsoft’s documentation here https://docs.microsoft.com/en-us/windows-hardware/test/hlk/testref/36463e42-7d6e-408e-933f-dbf56ea41e65
Systems that support Connected Standby MUST drain less than 5% of system battery capacity over an 16 hour idle period in the default shipping configuration.
Therefore, the battery drain must be around 0.3% per hour at worst, or roughly equals to 0.15W power consumption in standby.
How often does this occur?
Every sleep, with InstantGo enabled (default setting)
How can we reproduce this issue?
Put it into sleep mode for more than 10 minutes, then run either battery report command powercfg /batteryreport /output %USERPROFILE%\Desktop\battery_report.html or the sleep study command here powercfg /sleepstudy /output %USERPROFILE%\Desktop\sleepstudy_report.html to analyze the issue
From what I see, in energy report here powercfg -energy -output %USERPROFILE%\Desktop\Power_Efficiency_Diagnostics_Report.html you can see that ASPM is disabled in the system. It might be the cause.