How do you hook up a USB fan to a battery?

To make a lemon battery you have to have . . . 1 lemon 2 wires(one red one blue) 3 a 10 volt battery Hook up the wires to the lemon and then to the battery then turn it on and it should...

With any battery on any car, the negative cable is ALWAYS the first off and last on.

Audio battery???? If you mean Auto Battery then Red Positive (+) RED cable goes to Positive (+) post on battery. Black Negative (-) cable goes to Negative (-) post.

Hook up the positive battery terminal first then the ground. Make sure you know wich cable is wich. The ground ( usually black on American cars, brown on European ) will lead from the battery...

Hook positive up first, negative last.