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Car chargers for laptops

By bldsm ·
I have a few laptops - a Dell Latitude D510, an Acer eMachine and an HP something
and I want to buy a generic laptop power supply for my car which has a 12 volt battery). I have looked on the laptop corded adaptors and don't understand the amp verses wattage for each and how this relates to a 12 volt car battery?

What should I look for - does it matter - what about amp

Could someone please explain it to me?

Thanks
Confused (Bruce)

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