Celestron PowerTank Lithium Environment Friendly Power Pack for Computerized Celestron TelescopesCelestrons line of computerized telescopes offers users an amazing stargazing experience. The powerful lenses provide breathtaking views of the night sky while the preprogrammed library of celestial objects combined with a GPS system and motorized mount make it easy for you to quickly locate any object you want to observe even if its invisible to the naked eye. However, all of these features require power to function so you can either keep a large