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Welcome to IIS and congrats on your new scope!
I would suggest an AGM type battery. You should be able to get one with plenty of capacity for scope and dew heater for less than that jump start pack.
Then just connect up with crocodile clips to a ciggy socket. Jaycar usually carry the ciggy to 2.1mm cables for less than $5. Ask them to check that it is centre positive before you buy.
I've never had problems with the cable falling out of the scope. Batteries don't last very long, so focus on a small lithium or AGM battery and invest in a good charger to keep it topped up.
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