And to answer the questions about load splitting or dividing voltage, the two fans wired in parallel will share the AMPERAGE, the voltage across a parallel circuit stays the same. If you are running 2 4AA packs, the voltage will be 12 volts across both fans. Wire the positives and negatives of the batteries together. This will keep your voltage at 6 volts, but it will double the amperage you have, thus the fans will run twice as long, if you wire positive to negative, you will put 12 volts through the fans and burn them out.