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Black & Decker at Home Depot
This is the battery you need:
--2 AC outlets
--2 DC 12V outlets
--jumper cables
--tire inflator with gauge
--area light
--19-20 amp-hours
--under $100
--charger built in (uses simple extension cord to plug in to charge) that will not overcharge.
--100% more reliable than the low-reliability power tanks mentioned.
--not tippy
--charge indicator
I've had mine 5 years and it still charges right up and has about the same life.
--it will run the CPC1100 for an entire weekend.

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Will it power a dew heater or do you need another external power source for that?

This sounds likes a very good option.

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It has 2 12V DC cigarette-lighter connections, 2 110V AC connections, one Anderson power pole connector, and also comes with a male-male 12V connector cable if needed.
If you use dew heaters and power the scope in cold weather, I am not certain you could rely on the battery for 2 complete nights of observing. But if you use the dew heater at lower amperage or cycle them on and off, you probably could get two complete nights of power out of 19ah.

Sears also has a portable DieHard rechargeable that's 28ah.

When I wanted a battery that could run everything (scope, dewheater, laptop) for several nights, I used a 108ah RV rechargeable battery. At 60 lbs, it wasn't as easily portable. When I sold my 8" SCT, I sold it with a 56ah battery that only weighed 26lbs. Weight and capacity go hand-in-hand. The Black & Decker I recommended is fairly light and easily transported.

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