Photo 1 of Celestron – PowerTank 17 Telescope Battery – Rechargeable Portable 12V Power Supply for Computerized Telescopes – 204 Wh Power – Built–in AM/FM Radio, Siren, 2 USB Ports, Cigarette Lighter Adapter PowerTank 17, 12v 17Ah

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Photo 1 of Celestron – PowerTank 17 Telescope Battery – Rechargeable Portable 12V Power Supply for Computerized Telescopes – 204 Wh Power – Built–in AM/FM Radio, Siren, 2 USB Ports, Cigarette Lighter Adapter PowerTank 17, 12v 17AhPhoto 2 of Celestron – PowerTank 17 Telescope Battery – Rechargeable Portable 12V Power Supply for Computerized Telescopes – 204 Wh Power – Built–in AM/FM Radio, Siren, 2 USB Ports, Cigarette Lighter Adapter PowerTank 17, 12v 17AhPhoto 3 of Celestron – PowerTank 17 Telescope Battery – Rechargeable Portable 12V Power Supply for Computerized Telescopes – 204 Wh Power – Built–in AM/FM Radio, Siren, 2 USB Ports, Cigarette Lighter Adapter PowerTank 17, 12v 17Ah