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You will need to fork out and get a deep cycle battery - something like an AGM (absorbed glass matting) battery. I picked up a 45 Ah one from 4x4 place last year for $155 - normally about $200. The car-starting type batteries are really just meant to deliver a shed-load of current in a very short time, then sit quietly being charged by an alternator until the next time you start your car. THey are not meant to be discharged to any great degree repeatedly as will happen with an all nighter at the scope.
Even 45Ah may be too small if you want your laptop to go all night.
Generally you really only want to discharge these to about 40-50%, and your laptop will draw a couple of amps, plus the rest of your gear, though the mount is fairly minimal.
Adam
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