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This is more of a comment than an answer
– clhy
Commented Nov 24, 2015 at 17:03
when you say 'it wants 45W', what I think you mean is, it wants 20V. My laptop wants 20V and will draw initially a high current while charging (eg, 2.5A, which results in 50W drawn), and once charged, will only draw around 0.5A to keep the laptop fully charged while running (and not doing much) - but - it still wants the source to be 20V.
– Steerpike
Commented Feb 12, 2023 at 20:01

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