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a 900 amp car jump starter will not run your laptop for very long at all. It will power your mount all night but I'd give it just over hour or so with a laptop..based on personal experience with a 600amp jump starter which drained in under an hour
You need a 40 amp hour gel battery (or larger capacity, if you want to spend the extra- and also deal with the extra weight, these things get very heavy at this sort of rating). I can go all night with my 40 amp hour battery
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