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I also noticed the same battery problem after upgrading to kernel 4.13. Basically the battery drains even though the laptop has been regularly powered off (by about 30% in one day). I also used to have a similar problem with the wake-on-lan...however, that was solved long ago by permanently disabling the wol functionality.

I haven't been able to solve this new issue. What I know is: (1) If I boot my laptop from kernel 4.12 or from Windows 8.1, then the battery doesn't drain after shutdown; (2) If I force a shutdown by keeping the power button pressed, then the battery doesn't drain.

Any ideas?