Celestron accessory model # 18769. This is the 12v Car battery adapter cable to allow hookup to any cigarette outlet type connection. You can power off a rechargable 12V battery instead of using expensive AA's out in the field. I bought this for my Nexstar 5 and I am sure it will work will all those series scopes as well as the Ultima 2000, and other battery powered Celestron models. Ended up with 2 of these and this particular cable was used perhapes 3 times. Save some money buying new, Selling for $10 shipped to 48 state locations.
*********The PowerChord has a sale pending. Thanks to all who inquired, and thanks to Astromart!********