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    I'd suggest buying a kill-a-watt style power meter. They're not too expensive and you'll get exact values for your particular laptop.
    – gronostaj
    Commented Jun 10, 2021 at 7:00
  • Thanks! I thought there would be some study and statistics involved. I'll keep this post and see if anyone has related data.
    – Woden
    Commented Jun 10, 2021 at 8:27
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    My laptop can suspend for 12 hours or more without losing much charge. That means power consumption is trivial. I suggest you look at updating your power drivers.
    – anon
    Commented Jun 10, 2021 at 12:16