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Hi There,
Laptops are different and range from 15/16/18/19/20/22 or 24 volts, so you will need to consult your manual or read the required voltage imprinted on your laptop power supply unit. I recently purchased an Automotive Notebook supply (Jaycar, 6 Amp version) which is settable to any of those voltages mentioned, in my case 19volts. The unit is a step up power converter ie converts 12 volts to the higher voltage. It works really well and cost $48.
Regards IanG
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