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Actually, most laptops need 18VDC to charge, but will run on 12VDC supplied by the vehicle.
You just need to make a power cable with the proper end for the laptop.
1977 Cherokee Chief - The Blair Jeep Project III
A collection of parts flying in close formation
Yes there are 12v chargers, but anyone who has a company issued device knows that spending personal money on company equipment is just silly. I have an inverter anyway, so this works fine.
And the blender, come on, you don't make drinks by the campfire? I'm kidding, I don't have a blender, that was just a 120v item I thought of that someone might want. My airbed has an integrated pump that plugs into the wall, so the inverter mainly inflates that and then runs the laptop. I know, probably not necessary to tote around a 2nd battery just for those two items, but let's be honest...half of the stuff on these trucks of ours is unnecessary.
1990 Grand Wagoneer 440 swap, 727 MVB, NP208, D44 F/R 4.10 gears ZIP locker up front Detroit out back. So much other stuff. Check out the build.