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What size screen Graham, and does it have a DVD drive?
My 17" Acer (few years old) draws about 1.5A, so you generally need a pretty decent battery (unless you have a baby Atom based lappy).
For example, say 10hrs imaging, that's 15 Amp hours, and for a deep cycle battery not going below 30% means you would want at least a 22AH battery to start with for a single night. Generally you have to add in a bit for your mount (say 0.5A/hr), your dew control, camera, etc too though.
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