Only about 4 months old, works great. Charge lasts for hours, definitely more than an all-nighter. I sold my Nexstar and have nothing on the big dob to plug in...
$45 + shipping
Here's the specs:
Celestron Power Tank-12v Power Supply
Power Tank 12v Power Supply.
Includes the following Features: Adapter Charger Pug and Power Cord.
An 0.5A Krypton Flashlight
55 W Halogen Spotlight
Built in 3V, 6V, 9V output jack
You can use the POWER TANK as a source of starting aid
only when the vehicle battery is partially discharged.
The POWER TANK is not suitable for starting a vehicle
with a fully discharged battery!
Internal Batteries: One Pcs. 12V/7Ah Rechargeable Sealed Lead-Acid Battery.
32 degrees Fahrenheit to 86 degrees Fahrenheit
0 degrees Celsius t0 30 degrees Celsius
Model: #18774 - DC 12V Output: D.C. 12V/10A protect with Circuit Breaker.
DC 3,6,9V Output: D.C. 3,6,9V. Fuse 2Amp.
Weight: 8.4Lbs./ 3.8 kg.(Approx.)
Dimension: 288 H X 236 W X 132 D/ 11.3" H X 9.3" W X 5.2" D (Approx.)