Samsung just launched its new Galaxy Book Pro laptops at its recent Galaxy Unpacked event, with impressive design, specs, and mobile-focused features. Both offer thin designs, FHD AMOLED displays, and fairly large batteries. Samsung claims as much as eight hours of battery life from a 30-minute charge thanks to its new 65W fast charger, but the real story might be what the new charger is made with.

Samsung made quite a deal over its new Gallium nitride (GaN) charger at Unpacked. If you’re not familiar, Gallium nitride is a chemical compound found in many electronics but only recently made its way into smartphone chargers. The benefit of this is that GaN-based semiconductors can be made much smaller than silicon-based ones while providing the same output. This means a laptop charger can provide a large amount of power at just half the physical size and using fewer materials.

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