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What battery size is this? Celestron astromaster 70az finder scope. It looks just about smaller than a us penny. : r/telescopes
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Amazon.com: Celestron - PowerTank Lithium Telescope Battery – Rechargeable Portable 12V Power Supply for Computerized Telescopes - 10 hour capacity/86 Wh - Red/White LED Flashlight - 2 USB Ports
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