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A deep cycle marine battery might run your mount + DSLR over night, but I dont know about a laptop too...
You really want to look at a something around the 80~100AH mark if you want to run laptop, mount, dew heaters, camera/cameraS.... I've found these Astro toys of ours are bower hungry little buggers, and every I turn around, the power consumption of my setup multiplies... Ian's collection of batteries start to look tame when you've got 60~ cables hanging off your mount!
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