Hopefully I'm asking the obvious; but my computer is important so I would like more opinions. According to the question Laptop battery: is voltage really important to respect? It seemed their consensus was that modern laptops will accept a wide range of voltages into their charging ports. And second, I have a Lenovo T420. According to their currently suggested universal charger, it may output anywhere from 11.5 to 18 volts; and the original charger I have outputs 20 volts. So rather than this nonsense of inverting 12 VDC (nominal) from the car to 120 VAC and then rectifying it back down to 18 VDC, would there be any harm in interfacing my computers charging port directly with the car's DC wiring?
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