Question to those knowledgeable with cars!

Cars are like magnets

Don't risk it on a rented car :\

You can use your laptop, but you will need a special cable. As it is now, with the cable you have, it wont start the PC at all, I fear.

EDIT: After watching the vid, I must change my statement. You can use your computer in that car. Sorry about that.

OP this is more of an electrical question, not of automotive, but yes it will work, just be sure to not have it on without the car running (at least for a while) or it could kill the battery and need a jumpstart

the potential issue is the current. your laptop requires a minimum amount of current (amps) and the outlet in a car has a maximum amount of current it can provide (it may be labeled near the outlet, and should be labeled on the laptop power brick). if the maximum current the car can provide is less than the minimum the laptop needs, then you're going to blow a fuse in the car or not be able to power the laptop.

wont hurt the car or the laptop doing it but when i use my laptop in the car it will not provide enough power to both charge the battery and run the laptop at the same time and this laptop is... horrible

all you can really do it try it, worst that can happen is a blown fuse in the car which is really easy to replace

Your first problem is it might be DC current oppose to AC. Another might be that it won't get enough amps required to initiate charge, but should be enough to play off of. What current specs does it say on your laptops power pack? The big square thing. Amps.