Portable battery for fan/turbo

So it looks like my winter training will be in a basement, with no power points!
While I have seen turbo trainers that self power (or are powered by your legs at least), I haven't quite seen the same for fans, and so people have told me they've "heard" of others powering fans using a portable battery or similar.
Is anyone doing this, and is aware of any out there that should be looked at? Ideally not crazily expensive....
(For those who would say "just sweat", i've seen overwhelming commentary that this just isn't as effective, and therefore while it's still good, i'd be feeling like i'm really not getting as much out of it as i should
)
While I have seen turbo trainers that self power (or are powered by your legs at least), I haven't quite seen the same for fans, and so people have told me they've "heard" of others powering fans using a portable battery or similar.
Is anyone doing this, and is aware of any out there that should be looked at? Ideally not crazily expensive....
(For those who would say "just sweat", i've seen overwhelming commentary that this just isn't as effective, and therefore while it's still good, i'd be feeling like i'm really not getting as much out of it as i should

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You could go with a car battery and inverter though
Whoever says do it without a fan needs to do a session without a fan, as that would be the last time they say that.
You categorically need a fan, and if you don't, you're not working anywhere near hard enough :-)
Marin Palisades Trail 91 and 06
Scott CR1 SL 12
Cannondale Synapse Adventure 15 & 16 Di2
Scott Foil 18
Failing that buy some lights and ride the bike on the road.
if there's an accessible light fitting for a standard bayonet clip bulb, get an adaptor to take power from there, a normal fan won't take more current than a lighting circuit can handle
a battery + inverter would allow you to use a normal ac fan, you need to calculate capacity needed based on maximum operation time needed, you'll need a charger as well
Alternatively something like this would be better than a leisure battery (car battery)
https://www.maplin.co.uk/p/maplin-porta ... rter-a10hz
http://www.bikeradar.com/forums/viewtopic.php?f=40121&t=13077246&hilit=turbo+garage
Marin Palisades Trail 91 and 06
Scott CR1 SL 12
Cannondale Synapse Adventure 15 & 16 Di2
Scott Foil 18
Turbo training in the dark with no music or entertainment and no fan. Just you and the rats.