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Jeff, its easy and cheap to make your own. My one has a 12volt 18Ah deep cycle AGM battery you can buy on Ebay for about $50.00. I built a carry caddie complete with a cigarette lighter socket and a lidded area for storing tools, fuses and other odds and ends. All much cheaper than buying a Celestron Powertank.
Of course, you could make it to suit any size battery you choose.
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