Thanks for the battery suggestion Scott K. So you are saying that the Power Supply I have picked out is safe and adequate for all-nighters?
Yeah, it should be OK, especially since you aren't using a dew heater. I needed a dew heater, and those things can use quite a bit of power. Also the newer lx200's run on 12V, while my classic ran on 18v, so I lost some efficiency there as well. If you start trying to run lots of other stuff from it (camera + laptop, for example), I'd suspect you'd need a beefier battery. Even with some accessories I'd think you'd get several hours from your setup, just depending on the outside temp and what you are running. The scope itself is not that much of a power hog.