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Peter,
Sounds like you just need a good quality 12v charger and connect it directly to the battery internally.
Why not get yourself one of the microprocessor controlled types of sufficient wattage to allow for future expansion.
I am guessing that the battery in that unit isnt particularly large and probably with a laptop, camera system dew heaters etc would get over discharged each night anyway.
The charger will cost as much as the Celestron however - I see Amazon has those for $65 !
CTEK have a good range but I am sure there are Chinese equivalent smart chargers - get something with at least 3 stages, preferably 4 or even 5
For a large 100AH battery you would want 10A charging capacity or better.
Oops Martin beat me to it while I was helping the kids !
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