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As an example of battery powering a telescope I have a LX200 classic that I use for school nights and other displays. The telescope operates in alt/azm mode. Sessions usually run between 2 and 3 hours.
I have used a 12v 18 AH battery that was discarded from my golf buggy due to poor capacity 4 years ago after two years use. It gets charged up when I want to use it. It has never failed to last the distance for this use.
Barry
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