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Pumping 18V (P1900 minimum) into your 14.4V laptop isn't a good idea. Safest bet is to try to get a car adapter for the laptop and connect that to the 12V source on a P1900 or other power supply/regulator. If that doesn't work, you could probably work out some sort of resistor circuit to cut down the 18V but the easier way is to power an inverter from the PS/regulator and just plug the laptop into that.
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