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Over years, I've worn laptops (with sealed-in batteries) down to three-ish reliable hours. There are never enough power outlets (or AC vents or even seats at the table) for a big meeting. That's a problem for a very long meeting format like a war room or a promo committee.

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That's why you throw a couple of multi outlets in the drawer or a cabinet in that room.

Tech companies wire rows of desks for laptops and big monitors, but I think it'd be hard to find a meeting room where you could safely plug in more than a dozen 140 W chargers.

You probably can, as that's the max power, not the used power. To consume that much power you'd have to compile something with all the cores, and do something with the gpu (some rendering?), while the battery is being charged. And even then, I think there's a margin still on the power rating. (Running on solar, so I keep close eyes on my devices consumption). I believe most outlets are rated for 15+ amps, which is 1.8kW per receptacle (120v).

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