You have a laptop that runs at 50 watts!! wow!! What sort of internal battery does that have??
My laptop runs for two hours on a woeful internal battery (NICAD) of about 1.5 ah - at 17V. - 11 watts - I run APT the internet and maybe GHD and a webcam.
If I had a 50 watt laptop, I'd stick the output from the fan onto the corrector and the dew would boil off quick smart. To be honest I do have it on mains when in my garden as it has a brighter picture and doesn't keep going to screen save!
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