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Those jump starter packs usually have a standard AGMSLA(Absorbtive Glass Mat Sealed Lead-Acid) of around 7Ah to 12Ah size.
They aren't deep cycle but have a reasonable life when deep discharged, as long as they are re-charged as soon as possible and sat on a float charge whenever they are not being used.
If you have a decent charger it's probably cheaper to get them without the jump pack. Jaycar has the 7.2Ah for $29.95, a 9Ah for $42.95 and the 12Ah for $59.95, they won't last long thru the night with the sort of loads the OP wants to use though.
Jaycar also have DeepCycle batteries but not exactly the cheapest around... 26Ah for $139 and 38Ah for $199
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