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I have an 'SVBony' brand dew-heater from eBay that's USB powered. It plugs into the powered USB hub (2.4A) and keeps my scope dew-free. If I'm using the DSLR, then I have a large capacity battery pack that will power it all night long.
There are many options available and seem to be split between 12v and 5v (USB-powered), along with a multitude of controllers to drive them - some smart with auto-temperature/humidity sensors and some merely a potentiometer to control the voltage reaching the heater.
Cheers,
V.
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