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Some suggestions Rod.
The power pack that doubles as a car jump starter has enough
power to run several mounts and a dozen laptops for an hour or so. With a full charge
your power pack should run your mount,laptop, and camera for several
evening sessions, unless you are doing a hell of a lot of scope slewing.
I think your
problem was that you were charging the laptop and running a guide camera through a cable with too small a cross section, and therefore
getting a significant amount of voltage drop. I suggest that you
arrange a separate supply to the camera which will prevent you
getting problems during long exposures [which would be very annoying].
hope this helps
raymo
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