Picture of Portable Fan

I had a spare computer fan laying around along with some other parts, so I decided to make this portable fan.

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Step 1: Materials


12v. computer fan

2 9 volt batteries (preferably one good and one dead)








soldering gun


safety glasses

hot glue gun

Step 2: The case

Picture of The case
Use a screwdriver and pliers to open the case on the dead 9 volt battery. remove the "guts" and set them aside. now take the connector part of the battery you took apart and solder the positive wire from the fan to the negative terminal and solder another wire to the positive terminal. Now cut a hole for the switch in the side of the battery with the dremel. (use safety glasses)

Step 3: Case cont.

Picture of Case cont.
Now put the switch through the hole you made. Solder the negative wire from the fan to one prong on the switch and solder the wire from the battery terminal to the other prong. Hot glue the battery terminals and the bottom of the case back in place inside of the case. Now hot glue the battery shut. Finally, just hot glue the battery to the bottom of the fan.

Step 4: All done!

Picture of All done!
now just connect the good 9 volt battery and flip the switch. I posted a video below to show me using my fan. I hope you enjoyed this instructable. please rate and comment. thanks for viewing :)

tealk2 years ago
how long can last 9v battery on that fan?
musick_08 (author)  tealk2 years ago
It depends on the brand of battery and how often you use it. I used it for maybe 20 minutes once a month and it lasted over a year. Then I put the battery in something else
hopporto3 years ago
Looks great! i like the was that the empty 9 volt serves as a wire case. great idea!!
Earths_hope5 years ago
sorry, make that about 150 RPM
Earths_hope5 years ago
How many RPM does it have? I made one of these and it works fine with 2 AA batteries and it has about 50 RPM.
omegpirate5 years ago
fun fact: those little batteries are actually know as AAAA batteries lol
Thanks for the information.  Is there such a thing as an "A" battery?  Cordially, Nehmah
no prob and not that i know of
Wasagi5 years ago
 I would use a 9v and two AA or AAA's, to get exactly 12v, but it looks like it works fine with 9v. Great job! Really good use of the battery case!
musick_08 (author)  Wasagi5 years ago
thanks (: actually at first i wanted to do that so it would get all 12 volts, but i thought it looked better with just the 9 volt, and it still works really good.
Hiyadudez5 years ago

musick_08 (author)  Hiyadudez5 years ago
thanks (: