I recently bought one Narayan (about 4 or 5 weeks ago) and used it for the first time, extensively, at Astrofest. Mine was turned on just after sunset, left on until going to bed at between 3:30 and 4:30 in the morning and only missed one night in 6 due to cloud. It never missed a beat in all that time and I didn't find it getting overheated at all. During this time the camera was taking images or darks the whole time.
I wouldn't be without it now. The batteries are great for back up or away from 240V, but if I'm near a powerpoint I'll use the adapter
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