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I use a Supercheap jumpstarter (the yellow one - fairly heavy duty) for running the Meade LX200. Added to this, I went back to Supercheap, and got one of their $60 car batteries - just a Standard Duty 7-cell (I think it is). It runs everything else - the dew zapper controller with 3 zappers, the laptop, the AC adaptor for the DSLR, a hairdryer if needed, and anything else I may have forgotten to mention. And it has handles!
Allan is dead right - dew heaters are very hungry!
Next day, I plug in the jumpstarter to the wall for the day, and recharge the battery on the trickle charger ... for 4 hours only!
The reason I got the battery, is because I ruined the inside of the jumpstarter a little while back, and needed a backup until it was fixed. Now I just bring and use them both, so if I fry the 'starter again, I can jump straight over.
You also need some ciggy lighter attachments to suit (one with croc clips, and a multi plug attachment), using the battery method. Costs about another $15-20, but gives you several ciggy plugs.
My yellow jumpstarter is now 6 years old, and on it's original battery. I have never run it near 0% charge, so it has never had to worry about a heavy recharge cycle.
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