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Hi Petra, I use a small Panasonic gel-cell 12v battery (7aH) which runs my fan and my dew-controller and sits on one side of my dob base, The Argo Navis I just power using 2 internal AA alkaline batteries since these last for over 40 hours and I didn't want to worry about noise introduced by the PCM dew controller (although mine pulses so slowly it's probably not a big issue). The advantage for me in using a smaller 12v battery is it can ride on the dob base and I have no cables to trip over or catch when rotating the scope. Last time I used the fan and dew-heater for 2 hours and the battery was still over 12.5v so there's plenty of capacity even in a 7aH battery for this stuff.
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