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I have a Celestron CGE and have had a C8NGT and usually run both from the Celestron "tank", the source you are refering to. I also have a "jump start" battery from Auto Barn and use that as a second backup battery. It works perfectly and will run the scope for hours. I would suggest you look at one of these as they are considerably cheaper...I have a yellow one (middle size). Your scope probably came with a cigarette light cable, like mine did, but it is probably much longer than you will need so you may want to solder up a shorter version (keep the old one for the car and as a spare). Take it down to you local electronics store and make sure you get the right connectors.
The only problem I had was the first one did not charge, after 2 days it could barely light the internal torch. Took it back and swapped, checked the built in voltmeter at the checkout and it was on zero (it should have something in it, but not charged) and the needle didn't move. Grabbed a third one and it has never missed a beat, I use it for the CatCooler and as a spare for the scope.
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