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Sad,
The jump start I use has a 17AHr capacity which is the same as for the Celestron Power tank. If I remember correctly from when I bought mine, there is also a 24AHr unit available (more expensive). I got mine from Super Cheap Autos on one of their 20% discount days for $63.
The important thing with them is to not let them stay discharged for long periods of time, and this applies to all lead-acid batteries. I have run mine successfully for 2 consecutive nights on many occasions and not had any trouble. When the clouds roll in, I shove it on the charger and tend to leave it there as the units have a built-in intelligent charger which won't overcharge, just maintains the battery at full capacity.
As I said on my previous post, the 12Volt required (unless otherwise stated in your instructions, is probably a nominal voltage and running your scope at 13.6V from a fully charged 12 Volt battery is unlikely to cause any problems. Check with your scope supplier.
Robert
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