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G'Day Frank,
I used to have 3 batteries: a 7AH Celestron Power Tank to run the scope, a 24AH jump starter pack to run the dew heaters, and a 38AH jump starter pack to run the laptop.
The computer will be by far the heaviest power user.
After 12 months, my 38AH jump starter pack died... I had simply cycled it too deep too often.
If you want to run your computer from 12V I suggest you get the biggest deep cycle battery you can afford. Don't bother with jump starter packs - they are the wrong type of battery. Deep cycle is what you need.
FYI I haven't replaced the battery for my lappy as I now have the scope setup in the POD, so I put power on to run the lappy.
Al
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