Not anywhere near as good as the 240 volt version.....but it does the job...if you had the power of 240 volt running on 12 volt...I estimate it would last about 30 seconds on that battery pack....
The 12 volt still gets hot straight away but just not to the extreme heat and fan power like her big brother....anyway you shouldn't need a lot of heat to prevent or get rid of the dew.....
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