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I bought a 33ah AGM to run my laptop and a HEQ5Pro recently. The longest night I've run them both for so far was about 8hrs. Judging by the time to charge I'd taken 15 to 20ah out - bit more than I would have preferred. My laptop has a DVD drive, and seems to draw about 2ah guiding etc. The Heq5Pro I've usually run off a jumpstart battery pack in the past. If you're doing dew as well you might be pushing it to go a really long night. I'm not up on dew heaters and how much juice they draw however - I'm sure someone else can comment.
Then again, with one of the newer atom processer-based netbooks that draw a lot less current you might be ok.....
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