I found this comment on the Overunity forum
@All. i Discovered an interesting thing with some of my Bediniepowersupply Energizers . .. two of them will feed back to them selves and charge themselves . Thats all they do is run the fan . Its like a Toy .I use the positive output wire only ! not the negative ! the negative will be a direct short !!
So, I tried it and so far, it seems to be working. As he mentioned, I only connected the positive output back to the positive source. If it ends up stopping overnight, I'll suspect my battery first. It's a rechargeable 12v drill battery that seems to run down very quickly.
And yep, it just died. Turned up the fan a bit and spun it back up, but I'm thinking it will just keep dying from here on. I'll play with this a bit more, then I'll try it with a better battery.