PowerTank 17 12V Power Supply for Celestron Powered Telescopes Black 18777 - Best Buy
Amazon.com : Celestron - PowerTank Lithium Pro Telescope Battery – Rechargeable Portable 12V Power Supply – 17 Hour Capacity/ 158.74Wh - Red/White LED Light - 2 USB Ports, Black & Aux Port Splitter, Black : Electronics