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I got a 44AH 'V8 engine" jump starter pack from Super Cheap auto - cost was very reasonable (weight is about 15kg, so be aware of that) - 2 cig lighter sockets, 1 USB power socket. I bought a cig lighter cable splitter from Jaycar, and now have 6 sockets. I run 2 dew heaters, a CCD camera and a mount and laptop (through inverter). Does not even lose 1 bar of the charge meter after a full night (these are designed to be recharged after 3 jump starts of V8 engines, so, yeah, it's pretty gutsy). My mate Phil uses similar, and he powers a Takahashi EM-400 mount all night, and RARELY recharges it.
My prior 9AH battery pack that worked absolutely fine in QLD just could not handle low temperatures of Canberra, and would start beeping after about 4 hours - that is going from fresh recharge.
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