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That is be power draw at the outlet [0]. There is probably loss that occurs when drawing from an outlet that does not occur when drawing from the battery.

[0] https://www.notebookcheck.net/Our-Test-Criteria.15394.0.html

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There is loss to convert AC/DC, likely low 90s efficiency. Having an in-line DC power meter should be a very simple task, measuring the draw power from the outlet is rather pointless.

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