RE: DELL XPS 13 - something drains battery during the night
Thanks for posting.
This sounds like a software issue. You might try turning on "airplane" mode before you shut the computer down to see if that makes a difference. Some others have reported success by the following: (device manager->system devices-> Intel® management Engine interface-> (right-click) properties-> power management-> uncheck “allow computer to turn off this device to save power”).
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