Why a USB-C Hub Can Leave Your Laptop Losing Battery While Plugged In

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A hardware manufacturer explains that a 100 watt USB-C hub reserves roughly 12 to 20 watts for its own electronics, so the laptop receives less power than the charger's rating. Laptops that need more than the hub's advertised passthrough figure, such as some 16-inch models under load, will slowly drain while connected. Suggested fixes include charging directly through a second port, using a higher-wattage charger, or reducing the number of bus-powered devices on the hub. The article also notes that 4K at 60 hertz consumes more shared bandwidth than 4K at 30 hertz, which can slow attached peripherals and drives. Hubs that run hot may have a poorly designed conversion chip, a warning sign of potential failure.

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