How to power 2x 12v computer fans with batteries & 1 switch
This circuit should work assuming the fans are 12V. If the unmarked fan is 5V, it might not like having 9V applied. 12V fans won't run at full speed but this will make them safer for little fingers. I'm guessing that is a good thing.
Notice that there is a resistor added to your list of parts... You need that if you use an LED. You can repeat the LED part of the circuit in parallel to run more than one if you want. Make sure you use a fresh battery since the 12V fans may not self start at 9V. I tried this with a bench power supply on an old Dell 12V fan, and it didn't start every time at 9.0V but did at 9.3V. A fresh 9V battery should be around 9.6V.



simulate this circuit &ndash; Schematic created using CircuitLab