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I use one of those rechargable drycell batteries from a car parts shop. It is 12V 2.3Ah and runs a fan and LEDs all night for several nights between charges. It simply sits on my base and has velcro spots on it to fix it to the upright front board of my base. The wires from the fan loop over the front board into a connection box but you don't even need that to start.
For connections just extending your leads from the fan, putting a couple of clips on the ends and attaching them to the terminals would be crude but very effective. No switches necessary, easily done and leaves plenty of room for getting fancier later BUT it would have you up and running within 20 minutes of starting this "upgrade".
Cheers
P.S. Just make sure your fan is baffled so the air is forced around the mirror and up the tube for it to have its full effect.
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